Page:Popular Science Monthly Volume 21.djvu/152

144 remarking upon the apparent relations between the activity of vegetation and actinometric conditions, cites in illustration the promptitude with which plants mature during the summer of lands which the snow hardly leaves. Phanerogamous plants may be found at the height of twelve thousand feet, ranunculuses on the Schreckhorn, saxifrages on the Gravola, going through all the phases of their development in the space of three months under a mean temperature, according to ordinary estimates, considerably inferior to that of the polar regions. Doubtless these plants find a compensation for the unfavorable thermic conditions in the intensity of the solar radiation at great altitudes, which is increased by the reflections from the snow.

insists, in a number of communications to the French Academy of Sciences, that the venom of serpents contains a toxic substance analogous to the alkaloids and the ptomaines. The venom of the Vaja tripudians, of which a quarter of a milligramme will kill a sparrow, may be boiled, filtered, and treated with alcohol, without losing its activity. These properties indicate a relation with the alkaloids. Not only the saliva of serpents, the salivas of other animals—of the dog, the hare, even of man—are capable of exhibiting deleterious properties. An extract from human saliva furnishes an extremely poisonous liquid, capable of killing a bird almost as quickly as the venom of a serpent. Thus the saliva of man, the dog, and the serpent, all contain toxic alkaloids, and do not differ essentially except in the higher or lower degree of concentration of the poison; and it appears that animal as well as vegetable tissues are capable of elaborating alkaloids.

has been studying the influence exercised by the greater or less intensity of the nutritive phenomena in cases of poisoning by strychnine. Equal doses of strychnine were given to two frogs, one of which had been kept active for a half-hour previously. The poison took effect more quickly and more actively upon this one than upon the one that had been quiet. In another experiment, the poison operated more slowly and more lightly upon a frog that had been bled than upon the other one, which had not been hurt. When one of the frogs was bled after taking the poison, it exhibited a tendency to return to the normal condition in measure as it lost blood.

has been elected to fill the chair in the French Academy which was made vacant by the death of M. Sainte-Claire Deville, receiving forty votes to eighteen cast for his competitor, M. Laury, geologist. "La Nature" remarks that with M. Gaudry a new science, paleontology, obtains representation in the institute.

of Halle, maintains that the causes of earthquakes are much slighter than has been generally believed, that they may be sought at a depth of not more than ten or fourteen miles, and often of less, and that rather feeble forces may produce earthquakes which will be felt at great distances. The hammer in Krupp's factory, which weighs a thousand [sic]centners, and falls from a height of ten feet, produces sensible concussions over a surface five miles in diameter; and a recent explosion in a dynamite factory was felt at between twenty-five and thirty miles away. Dr. Fritsch points out how earthquakes might and must be produced by the increase and decrease in volume of rocks under the influence of physical and chemical forces, by concussions, by the opening of crevices in rocks, and by the subsidence of masses of rocks due to these agencies.

medical officer for the Holborn district, London, says in his latest report that, whatever may be the cause, there is no doubt that a Jew's life in London is, on an average, worth twice as many years as a Christian's. The Hebrews of the metropolis are notoriously exempt from tubercular and scrofulous taint. Pulmonary consumption is very rare among them. The medical officer of one of the Jewish schools has remarked that their children do not die in anything like the same ratio as Christian children. In High Street, Whitechapel, the average death-rate on the north side, which is occupied by Jews, is twenty per thousand, while on the south side, which is occupied by English and Irish Gentiles, it is forty-three per thousand.

F. L. S., made thirteen experiments last summer in inoculating wheat-plants with the fungus of the barberry-bush, and derived results adverse to the theory that wheat-mildew is developed from the fungus. One hundred and seventy-six plants of wheat were employed, seventy-eight of which were inoculated with the barberry-fungus, and ninety-eight un-inoculated ones were kept for check plants. Seventy-six per cent of the inoculated plants developed the rust in about fifteen days, and seventy per cent of the uninoculated plants developed it also. Only one experiment of the thirteen seemed to support the theory of metamorphosis.

has been exhibiting some remarkable rapid-process photographs in Paris, one of which is said to have been taken in one hundredth of a second. He has obtained a series of six photographs during the leap of a clown, which when projected on a screen by a zöetrope exhibit the clown as in motion, with all his changes of position.