The Arkansaw traveler., 1886-05-01
Complied for The ArtdAsabc Trdteier SCIENTIFIC MISCELLANY

rom resin collected III the forests
 \ young German chemist has ker, blood uncoagulated for many days |, coating the interior of its receptacl.. with oil
 \ French microscopist has studiej the action of the various condiments oH the tissues of the oyster, and recon mends lemon juice as the most vah,- able, a. it destroys the animalcula it., festing the stomach of the mollusk.
 A glass of greatly improved quali,y has been made by Dr Carl ZeiSs, ot Jena, for microscopic obiectives. Lense> of the new glass give images of wondtl ful clearness, and have greater resolving power than has hitherto been known
 A Rare Find-The brick clay deposit, of IIainstaeit, Germany, have been found by pr Strohecker to be singulark rich in several metals hitherto very scare particularly cerium. glucinum, lantha num- didymium and yttrum The first
  cient abundance to materially increase the worlds supply.
 Force of Arrows.-W ondcrful storir, having been told of the feats of Savag,. archers in piercing armor aud trees >ey. eral inches in diameter. Prof O. T Mason of the Smithsonian Institution requests archery clubs to make caretu! experiments upon the distance of rang, greatest distance of accurate projection momentum at leaving the bow, ant penetrating-power into animals of ar rows.
 Condensed Sweetness in Medicine At recent meeting of the Royal Dublin Society. Prof F. Reynolds called atten, ton to the importance of saccharin to medical men for sweetening the food of patients to whom sugar would be injur- ious This substance, obtained by Prof Falberg from coal-tar, is said to be two hundred and thirty times as sweet sugar, and experiments thus far made have shown no harmful effects from it> use. Its present cost in England i, about $l0 per pound
 an-Mountains.--A French geolo- giSt, Mons de Lapparent lately called the attention of the Paris Geologica Society to the effect grayitation has ill heaping up Sca-waters about the land i The continents are thus all situated at the tops of hills of water: and in cross
 ing the Atlantic the ship has first to % down hill, then to cross a valley, and finally to climb another hill The cal culation has been made that in mid ocean tho surface may be more than half mile (l000 metres) below tho level it would have if the continent, cNertcd no attraction.
 Work of rvatories.-Progress ill astronomy no longer depends upon chance observation, but is now effected by division of labor and a concentra- tion at certain points upon some one particular object of research The lead ing observatories all work at specialtics At Harvard the relative magnitude of the stars receives chief attention; at Princeton, spectroscopy; at Alleghany Observatory, the dark part of the solar spectrum and the effect of the invisible heat rays on the earth; at the National Observatory, positions and orbits of satel- lites at Cincinnati, double stars; at Chi cago the surface of Jupiter; and at Al banv and Yale. the periecting of map, of the heavens
 Light Two Miles Under Water-In the Lake of Geneva Me>srs Fol and Sarasin found sufficient light to affect very sensitive photographic plates at about five hundred and fifty feet. the light at that depth being about equal al midday to that at the surface on clear moonless night In the Mediterranean during bright sunlight the last trace of light was lost at a depth of ,3OO feet But an examination of the eyes of ccr- tain cruS Staceans lately dredged from the ahys~mal regions of the Atlantic con vinces Prot. <. l. Smith that despite the objections of physicists, some light probably reaches even beyond l20oo feet. He thinks that. on account of the purity of the water in mid-ocean light might reach this depth as readily as 5000 feet or even 1OO feet near the shore
 An Enterprising Insect-A most re- markable instance of the extension of the geographical distribution of species is found by MT. ]. J. Walker of the British navy in the beautiful butterfly l Innsin nIcrinnns L nr Dnnnis nrchil-