Popular Science Monthly/Volume 45/October 1894/Notes

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NOTES.

In the present course of thought and life Prof. George E. Howard sees a crisis which is determining the character of the modern university. Thus there is a growing tendency to abandon the traditional assumption that there is an essential difference in the scholastic value of studies. A new test of scholastic fitness has arisen — the test of life. All things are in process of development; whole departments of knowledge, hitherto unheard of in the schools, have received recognition. Old subjects which were thought dead have turned out to be but sleeping. Thus philosophy and the classics, subjected to the comparative method, are being made more productive than ever before for social good.

A report on the climatology of the city of Mexico, based upon hourly observations continued through sixteen years (1877 to 1892), is published by Señor Barcena, of the meteorological observatory there. The mean annual temperature is 15·4° C. The mean monthly temperature ranges from 12° C. in December to 18·1° C. in May. The highest temperatures in the shade range from 23° C. in December to 31·6° C. in April; while the limit of lowest temperature runs from —2·2° C. in December to 8·2° C. in August and September. The most rainy months are those from June to September.

A "Bird day" has been established in some of the schools of Oil City, Pa., the object of which is to promote "preservation of American birds from the women who wear them and from the small boy." The literary exercises are similar to those customary on Arbor day.

Frogs are credited by Dr. Romanes, in his Animal Intelligence, with having definite ideas of locality. A Japanese correspondent of Nature says that the same fact has been noticed of old by the Japanese and Chinese. Rejoan Terashima, in his illustrated Cyclopædia of the Three Systems of Japan and China (completed in 1713), says that "when frogs are removed far, they always long after the original locality; hence the Chinese name Hia nia." For similar reasons the Japanese call them "Kaeru," meaning return. This author is confirmed by the lexicographer Shisei Tagawa.

Experiments made upon certain fresh-water crustaceans, says the International Journal of Microscopy, show that they are sensitive to sounds corresponding to more than forty thousand vibrations per second (sounds that we can not hear), and to ultraviolet rays that we can not perceive. Now, all the rays that we can perceive appear to us with definite colors, and it should be the same with these animals; so that it is probable that they see colors that are unknown to us, and that are as different from those that we are familiar with as red is different from yellow or green from violet. It follows from this that natural light, which seems white to us, would appear colored to them, and that the aspect of Nature would be entirely different to them from what it is to us. It is possible, therefore, that to certain animals Nature is full of sounds, colors, and sensations that we have no idea of.

An English committee of sportsmen and naturalists is taking in hand the protection of South African mammals — the giraffe, zebra, eland, gnu, koodoo, and other antelopes — against their threatened extinction. A suggested method of accomplishing this is to secure an inclosed park of about a hundred thousand acres.

In a new process for coloring leather by electrical action, the hide is stretched upon a metallic table and covered, except at the edges, with the coloring liquid. A difference of potential is established between the liquid and the metallic table. The effect of the electric current is to cause the pores of the skin to open, whereby the coloring is enabled to penetrate deeply into its tissue.

A bust of Charles Waterton, the naturalist and South American traveler, executed by the late W. Hawkins in 1865 — the year in which Waterton died — has been presented to the Linnæan Society of London by the trustees of the late Mrs. Pitt Byrne. The only accessible portrait of Waterton is from an original oil painting made by C. W. Peale in Philadelphia in 1824. An engraving of it forms the frontispiece of the third volume of the Essays on Natural History. The bust and the portrait correspond well when allowance is made for the forty years' difference in the age of the subject.

Dr. Franz Stuhlman, who accompanied Emin Pasha into the heart of Africa, saw much of the people called Pygmies. He looks upon them as the remnant of a primeval race which at one time occupied the 864

��THE POPULAR SCIENCE MONTHLY

��whole of tropical Africa and southern Asia. They have lost their original langiiage, and have been encroached upon by surrounding tribes, even within the dense forests to which they retired, until they are met with only in scattered remnants. No trace of degeneracy is to be found among them, for, according to the accounts, they are well proportioned " and certainly not rachitic."

Evidence is adduced in Nature, by J. Howard Mummery, contradictory of the hy- pothesis that caries of the teeth is a modern disease and confined to civilized races. The author's father, in a communication to the Odontological Society in 18V0, brought to- gether the results of an inquiry extending over more than ten years, in which he exam- ined more than two thousand skulls, and was brought to very different conclusions. Among thirty-six Egyptian skulls, caries was found in fifteen (41-66 per cent) ; among seventy- six Anglo-Saxon, twelve (IS-TS per cent); among one hundred and forty-three skulls of Romano-Britons, forty-one (28-6'7 per cent) ; and among fortj'-f our miscellaneous skulls of ancient Britons, 20-45 per cent, showed cari- ous teeth. Of modern savage races, among the Tasmanians, 2*7-7 per cent, of caries was found ; among native Australians, 20-45 per cent ; among East African skulls, 24-24 per cent ; &nd among the skulls of West African natives, 27-96 per cent.

Books are protected in India against the attacks of insects by pouring a few teaspoon- fuls of refined mineral naphtha, or benzine collas, into the crevices of the binding, and then shutting up the volume in a close-fitting box. They have to be afterward sprayed over lightly with the finest kerosene oil, which should be rubbed off before it pene- trates the binding. Another way is to brush the books over with a saturated solution of corrosive sublimate. In the Indian Museum Library the books are kept in close-fitting glass cases with a few ounces of naphthaline upon each shelf. The paste used in binding these books is also poisoned with sulphate of copper.

In the Kelvingrove Museum, Glasgow, is a crow's nest from Rangoon made of iron wire, such as is used in fastening the corks of aerated water bottles. Mr. Campbell, of the museum, quotes from the donor of the curiosity, who says that such nests can al- ways be obtained from high trees in the vicinity of the factories of aerated water.

An extensive series of minute chipped stone imi)lements from India, which has late- ly come into the possession of the United States National Museum, is described by Curator Thomas Wilson as comprising every condition of the implement and having the single peculiarity, in which these differ from other prehistoric implements, of remarkably small size. The cores are rarelv more than

��an inch and three quarters in length, and the blades are rarely more than an inch and a quarter or an inch and a half, the majority of them being not more than an inch, while the finished specimen is frequently not more than five eighths of an inch in length. The finished implements are of various forms slim, almost needlelike, triangular, with a base convex, straight, or concave, quadrilat- eral, trapezoid, rhomboidal, while the most delicate and finely finished are in the form of a crescent.

In their woodcut engi-aving, according to Mr. T. Tokuno, of the United States Na- tional Museum, the Japanese artists strive to imitate the original, even to the sweep of the brush, so closely that it shall be difficult for an inexperienced person to detect the differ- ence, and they have been wonderfully suc- cessful. The methods employed by them are those used in Europe in the fifteenth, sixteenth, and seventeenth centuries. The material is wood cut in the direction of the fiber, or planks, for which since Bewick's time blocks cut across the fiber have been substituted with us.

The chief features of the Karst (lime- stone) regions of eastern Europe, according to Dr. Jovan Cirjic, are those known as karren dolinen, blind valleys, and poljen. The karren are surfaces composed of blocks of limestone separated by narrow fissures. The dolinen, called by English writers swal- low holes, sink holes, or cockpits, are rounded hollows varying from thirty to more than three thousand feet in diameter and from six feet to three hundred and thirty feet in depth, and great numbers of them often oc- cur in a limited space. They may be dish, funnel, or well shaped, or of other forms. Besides the simple basins, the dolinen also oc- cur in the form of chimneys communicating below with blind cavities or with under- ground river courses or systems of fissures. The first are known in France as avens, and the second in Jamaica as H</7it holes.

In the Mining School at Houghton, which had one hundred and one pupils in 1893, Michigan claims to possess the largest school of mining engineering in the United States. The school also excels in the number of graduates in proportion to its age. Its pu- pils are mostly farmers' sons, and twenty- three States and foreign countries are rep- resented among them. Its equipment has been planned with the idea of providing the means for each student to occupy his entire time without obliging him to wait, and of making the laboratory take the place, to a large extent, of instructors. Candidates for admission are expected to be proficient in the use of the English language and in the special subjects required, including the solu- tion of practical problems in mathematics. A three years' course is prescribed.

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