Page:Popular Science Monthly Volume 39.djvu/883

Rh detailing an experienced observer who acts as director and supervises the work carried on in an office furnished by the State Experiment Station.

a paper on the Occurrence of Tin in Canned Goods, read in the American Chemical Society, Prof. H. A. Weber related a case of poisoning from eating pumpkin-pie made from canned pumpkin, in the investigation of which he had found as much as seven maximum or fifty or more minimum doses of tin salts in a pound of canned pumpkin. He had also found large traces of tin in canned fruits and tomatoes. The paper was very generally discussed, and it was agreed that the subject ought to be investigated. There is considerable difference of opinion among chemists concerning the extent and even the reality of danger from this source.

informed the American Association that he has discovered a latent quality in aluminum which adapts it in a remarkable degree to use in the construction of sounding-boards. He has found that it differs from all other metals, so far as he is aware, in being free from the comparatively continuous and uniform higher partial tones that give the tone-color called metallic; and that it possesses an elasticity capable of sympathetic vibration uniform through a wide range of tone-pitch, that renders it in that respect superior to wood. The thickness of the sheet may be so reduced as to obtain the utmost amplitude of tone vibration without injury to the quality of the tone; and in this it is superior to both wood and other metals.

photochronograph is an instrument intended to remove the personal equation in transit observations (astronomical) by means of photography. It was devised by Prof. Bigelow, of Woodstock College, and gave very satisfactory results as a first experiment with the star Alpha Aquiæ. The first apparatus was soon superseded by a second, and the second by a third, each being improved as the experiments suggested. An account of the instrument and its workings is given in a special publication of Georgetown College Observatory.

Association of Agricultural Colleges and Experiment Stations adopted a resolution, at its recent meeting in Washington, asking the Secretary of Agriculture, in the interest of forest preservation, to secure the passage of laws exempting from sale or pre-emption Government forest lands now unsold, and to cause them to be surveyed, reported upon, and protected. It also suggested that the Weather Bureau organize and, co-operating with the agricultural colleges and stations, assist in maintaining a study of climatology in its relations to farming; and that the sphere of this work should be enlarged to include the physics, conditions, and changes of agricultural soils.

was discovered lately on the slope of the mountain at Baden which had evidently been used in the middle ages and long previously. Remains of the foundations of a vestibule were found at the entrance. In a niche hewn out of the rock was an altar with the sacrificial stone table. In front of the cavern was a regularly constructed building, fully ten feet below the surface of the ground above, designed probably to conceal the cavern behind, which may have been employed as a temple to Mithra. There were two stalls for horses, fragments of utensils, knives, flint arrow-heads, and carved bones, mixed up with Roman coins, lamps, and stamped tiles.

of lectures on the work of the Rothamstead Agricultural Station was delivered at Washington by Mr. R. Warrington, Vice-President of the Chemical Society of England, during the recent meeting of the Association of American Agricultural Colleges. At the conclusion of his lectures the speaker congratulated our country on having more than fifty experiment stations, each of them endowed with an income equal to or surpassing that possessed by Rothamstead; but advising his hearers that if at the end of fifty years each of our stations is to show a record of work done equal to or surpassing that accomplished by the old station in England, it will only be by each one pursuing its work in the same spirit of accuracy, thoroughness, and patience that has characterized the Rothamstead experiment.

minor planets 296, 297, 298, 300, 302, and 303, have been named respectively Phaetusa, Cecilia, Baptistina, Geraldina, Clarissa, and Josephina.

address of Vice-President J. J. Stephenson before the Geological and Geographical Section of the American Association was on the relations of the Chemung and Catskill formations on the eastern side of the Appalachian basin. The speaker found that the deposits were not made in a closed sea, but that the influx of great rivers with their load of débris made conditions of the shallow basin such that life could not exist; and that in the present state of our knowledge we are not justified in including the Chemung period in the Carboniferous age.

British consul at Hankow, China, writes that the varnish exported from that city is the gum of the Rhus vernifera, or varnish-bearing sumach. It has to be collected and strained in the dark, as light spoils the gum and causes it to cake with all the dirt in it. And it can not be strained in wet weather, because moisture causes it to solidify; but then it should only be used in wet weather, as, if the atmosphere is dry when it is rubbed on, it will always be sticky. As used by the Chinese, the varnish takes about a month to dry, and during the time it is drying it is poisonous to the eyes.