Popular Science Monthly/Volume 37/September 1890/Notes

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NOTES.

Prof. J. W. Spencer has extended the observations of Mr. G. K. Gilbert on the old beach surrounding Lake Ontario at a distance of several miles from the shore of the present lake. He has traced it along the Canadian side, and at the eastern end, where Mr. Gilbert had not been. For the ancient body of water that occupied the basin bounded by this beach, he proposes the name Lake Iroquois. The gravel ridges forming the several portions of this beach were used by the Indians for their trails, as they afforded dry pathways through a country elsewhere often muddy. The fact that some parts of this beach are higher than others is explained by the warping of the crust since the beach was formed.

It is contended by Mr. Alexander Bowbronicki that an unhealthy town has no other meaning than a proportionate accumulation of decaying or putrescible matter. Thus, in Manchester, England, the causes of mischief are overcrowded streets, badly kept; surface impurities in streets, yards, and corners; and sewers of such construction as admits of their structure becoming sodden and of their charging the surrounding subsoil with filth, whereby the atmosphere is contaminated by the escape of the foul air through the ventilating holes. The author believes that sewers are to protect the subsoil against contamination from the surface and to maintain as steadily as possible the level of the subsoil water, rather than to remove superficial and closet foulness; and that that should be disposed of by the pail system.

A complete account of Prjevalski's zoölogical observations and discoveries during his expeditions to central Asia is in course of publication in Russian and German text, at the expense of the Imperial Crown Prince Nicholas of Russia. NOTES.

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��Dr. J. Walter Fewkes has described in The American Naturalist some specimens of excavations made in rocks by sea-urchins, which he observed at Grand Manan, New Brunswick. Other places where such exca- vations have been found are Florida, the West Indies, Panama, California, the Medi- terranean, coasts of the British Isles and France, and Australia. The holes, which are occupied by the animals, are never deeper than the thickness of the urchins' bodies, and are very smooth. It has been suggested that the holes are worn by the spines of the animal, or perhaps chiseled out by its teeth, and Dr. Fewkes adds that perhaps motions of the animals caused by waves aid the pro- cess of erosion. Another recent paper by Dr. Fewkes describes some Californian Me- dusa, with plates.

A writer in the North China Herald of Shanghai asserts that the climate of Asia is growing colder, and its tropical animals are slowly retreating southward. In proof of this he quotes evidences, historical and ref- erential, of the former existence of ele- phants, tigers, and leopards in China. Tigers and leopards are, however, not yet extinct in China, and are common enough in Corea. The bamboo, it is said, formerly grew natu- rally in parts of the country where it now has to be taken care of.

The Central Park Menagerie had 907 an- imals on exhibition during 1889, represent- ing 242 species, 164 genera, and 71 families. The most notable additions to the collection were, by gift or exchange, a three-toed sloth, an American civet-cat, very seldom seen alive in zoological collections, and a pair of young elks ; and by birth a sea-lion, two nylghaie antelopes, and one hippopotamus. The last died four days after birth. The principal cause of death among the animals was con- gestion of the lungs.

" To get rid of the timber," the answer given to an inquiry from the Michigan State Forestry Commission respecting the timber policy of the State of Arkansas, is made by Mr. William Little the text of a letter to the Montreal Board of Trade on the importance of preserving the timber. The interests of the United States and Canada in this mat- ter are substantially the same. Having shown that the forests of the continent are on the verge of extinction, and having pointed out the lesson that the people of the United States will shortly be taught, if our political bosses impose a restrictive duty on Canadian lumber, the author warns his countrymen that if they continue stocking our saw-mills with logs taken from this al- ready too scanty supply, and keep warring on their forests, they will soon be able to " get rid of their timber," and to get rid at the same time of the most valuable property they ever had or may ever expect to have in their country.

��A group of papers from the Journal of Mycology on The Treatment of Plant Dis- ease is published in a separate pamphlet by Jhe Section of Vegetable Pathology of the United States Department of Agricult- ure. The relation of Mr. A. A. Crozicr's experiments on the effects of certain fungi- cides upon the vitality of seeds shows that soaking in blue vitriol and in copperas tends to retard germination. Prof. Byron D. Hal- sted contributes an investigation of the scald and gall fungus of the cranberry. Other papers, by different authors, relate chiefly to other fungoid diseases and to the qualities of fungicides.

Six scholarships have been established in the Missouri Botanic Garden to provide six years' courses of theoretical and practi- cal instruction for young men desirous of becoming gardeners.

Although there is a wide enough field for platinum-plating in the making of vari- ous kinds of instruments and apparatus, such great difficulties attend the process that it has never been made a commercial success. In the first place, the metal tends to separate from its salts in the spongy form instead of forming a firm, hard coat- ing. Then, too, platinum is so insoluble that plates of it can not be used for keep- ing up the strength of the bath. Mr. Will- iam H. Wahl has communicated to the Frank- lin Institute a method of depositing platinum by which these difficulties are largely avoid- ed. For keeping up the strength of the bath he uses platinum hydrate, which dissolves freely in aqueous solutions of the alkaline hydrates, forming platinates. These plati- nate solutions conduct electricity freely and yield bright, reguline, and adherent deposits of the metal.

On the French coast of Croisic may be seen thousands of little sea-urchins ensconced in cavities in the granite rock, the openings of which are too small to permit their in- gress or exit. The animals, it is not doubted, make and widen the holes for themselves, but the question how has not been answered. Chemical solution of the rock does not seem possible, as no sufficiently strong acid is found in the animal. M. John has recently explained it by mechanical action. With the so-called lantern of Aristotle, a curious formation with which the animal breaks up the hard substances on which it feed?, it probably bites the rock ; the sucker-feet are attached, and a rotary motion is im- parted to the body, the spines and the lan- tern slowly wearing down the surface of the rock.

A report of the first systematic attempt to determine whether beets can be raised successfully for sugar in Nebraska is given in Bulletin No. 13 of the State Agricultural Experiment Station. Beets had been raised

�� � on the Industrial College farm that yielded over fifteen per cent of sugar, when, in the spring of 1888, the people around Grand Island undertook to demonstrate that beets could be raised there rich enough in sugar to warrant investment in a sugar plant. The result was satisfactory, and the experiment was extended through the whole State for the season of 1889. The results are detailed in the Bulletin.

The natural result has followed the offer by the Government of India of rewards for the heads of snakes. The Chief Commissioner of the Central Provinces reports that the natives there are beginning to breed and raise poisonous snakes for the sake of getting the head-money offered.

A monument to M. J. C. Houzeau was to be unveiled at Mons on the 2d of June.