Popular Science Monthly/Volume 22/January 1883/Notes
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Dr. D. E. Salmon has pursued parallel investigations with those of M. Pasteur, of the microbe of hen cholera, and has conclusively satisfied himself of the accuracy of the results announced by the latter. lie regards his researches as demonstrating that the virulent liquids of the fowl's body contain micrococci, that these can be cultivated, and that liquids in which bacteria are cultivated produce the disease by inoculation. His experiments indicate that the activity of the virus is destroyed at a temperature of 182° Fahr.
George II. K. Thwaites, Director of the Royal Botanic Garden at Peradeniga, Ceylon, died September 11th. He was appointed to the position in 1849, and in connection with it published in 1858-'64 an enumeration of the plants of Ceylon ("Enumeratio plantarum Zeylanice"). He was active in introducing to the island the cultivation of cinchona, tea, cocoa, Liberian coffee, and the India-rubber tree.
According to Mr. G. Macloskie, the elm-leaf beetle hibernates in cellars and attics in countless numbers. Three broods are brought forth in a season. This destructive insect is found only in the Eastern States and parts of New Jersey and Pennsylvania. Poison is the most complete remedy for it—one pound of London purple to one hundred gallons of water, squirted up into the tree. 432
��THE POPULAR SCIENCE MONTHLY.
��Louis Palmieri, Professor of Physics in the University of Naples and Director of the Seismological Observatory on Mount Ve- suvius, has recently died, at the age of sev- enty-five years. He was appointed to the two posts in connection with which he has gained scientiiic renown in 1854, and has since pursued the study of earthquakes and the phenomena associated with them, with a real devotion. lie was the inventor of an electro-magnetic seismograph, by which the most delicate indications of subterranean action could be detected.
M. Potel has recently submitted to the French Society of Encouragement a new substance, which he has named, after him- self, " poteline," and which appears to be susceptible of numerous applications. It is a mixture of gelatine, glycerine, and tannin, and is, according to the inventor, absolutely impermeable to the air. When warmed, it becomes liquid, or nearly so, and takes all the contours of an object. M. Potel has made corks of it, which form an economical substitute for metallic capsules, and secure an hermetic closing. lie has used it as a coating to preserve meat. At a temperature of 112, it envelops the meat, kills the genus of putrefaction, and prevents any new germ passing in. According to M. Potel, meat thus treated will retain all its freshness for two months.
According to the experiments of M. Demarcay, the metals which are generally regarded as fixed, even iron, give out real vapors at relatively low temperatures. Cad- mium, for example, volatilizes at 25*7 and zinc at 302. Magnesia had already been found to be volatile below a red heat, when acted upon by water and chloride of silicon.
With the aid of M. Lippman's electrom- eter, M. Trousseau has succeeded in meas- uring the electrical conductibility of the poorer conductors, particularly of glass. Common glass is very perceptibly conduct- ive, Bohemian glass is less so, while cut- glass has no sensible conducting powers. M. Dumas regards this classification as re- peating from the electrical point of view the one which he has established as dependent on the presence of alkaline salts in the vitreous mass ; of which cut-glass has none, Bohemian glass very little, and common glass a considerable quantity.
Admiral Count Feodor Petrovitch Lutke, founder of the Russian Geograph- ical Society and President of the St. Peters- burg Academy of Sciences, died in August last. His name is identified to a considerable extent with the history of Russian polar and exploring expeditions, and with the discov- ery of some island groups in the Pacific. He had published narratives of his Arctic expeditions and of a voyage round the world.
��The fact that an aniline black can be formed with vanadium has provoked inves- tigation into the feasibility of the produc- tion of that metal for commerce. MM. Osmond and G. AVitz have found a consid- erable source of supply in the foundrj--sco- rias of Creuzot, France, which contain two per cent of vanadic acid. The scorias have only to be treated with hydrochloric acid to obtain from them a green liquor which can be used directly in dyeing.
It has been urged against the theoretical importance of the agency of insects in fer- tilizing flowers, that the insects relied upon are rare upon mountain-heights, where the flowers that should be fertilized by them are still abundant. The observations of M. Ch. Musset, of Grenoble, France, which range up to 10,000 feet in height, tend greatly to break the force of this objection. He finds that all the orders of insects are represented to the height of T,400 feet, and that the number of nectar-seeking insects is proportionate to the number of flowers. The hours of wakefulness and of sleep of the nyctitropic flowers the number of which is greater than is supposed and those of the insects are synchronous. The apparent num- ber of nectar-seeking insects, also, is related to the number of their favorite flowers.
JoriANNES Theodor Eeinhart, Professor of Zoology at the University of Copenhagen, and Inspector of theNatural History Museum of that city, died October 23d, aged sixty-six. He was eminent in ornithology, and was au- thor of a memoir on the birds of the Cam- pos of Brazil, and of numerous papers in the scientific periodicals of Copenhagen.
M. Bergeron has produced imitations of the forms of lunar craters, by turning a current of gas into a melted metallic mass at the moment when solidification is about to begin. He obtained exact representations of the different varieties of hollows shown upon the moon by using different metallic mixtures.
Professor Sollas, of Bristol, has pro- posed to the British Association a scheme for securing a complete record of published scientific work, the essential feature of which is, that each nation furnish a record of its own work and of that only, and exchange with all other nations for their records. National committees are to attend to the preparation of the records, the transmission of exchanges, the translating and the com- position of the records into a single work, and an International Congress is to take care of the uniformity and the successful work- ing out of the scheme.
TnE death is announced, at forty-three years of age, of M. Georges Leclanche, the inventor of the oxide of manganese constant elements.