The Montgomery advertiser., 1904-10-17

electric current. a glass plate remains apparently unchanged. but on Dreath- ing mon it characteristic discharge figures appear. These figures, however. disappear when the glass Is cleaned. The magic prints are made permanent by Hans Axmann, German physicist by using an induction apparturs giving sparks of about 20 inches. and connect ing one pole with the edge of the glass plate and the other pole with a sort metal electrode of suitable shape held upon the glass by slight pressure The experimenter has kept for ten years plates on which, in spite of all clean ing, the discharge figures stand out clear and distinct whenever the breath condenses upon the glass.
 A novel apparatus for destroying in- sects and larvae upon the ground has been presented to the Odessa Technical Society by NJ. Lokuzejewski. horse or motor wagon carries a small dyna- mo, which Is geared to the axle, and is connected with an induction coil with , a Wehnelt interrupter. The negative pole of the coil Is connected with the iron framework to the earth, while the positive pole at high tension charges series of metallic brooms behind and under the wagon. These brooms nov
 
 sparks. and any insects within range are killed
 Oxygenated water at twelve volumes is proI Atnced by M. A. Renard the best preservative of milk. Added di- rectly after milking in the proportionj of two to three per cent. 1t decom- poses in six or eight hours into water and oxygen, leaving no foreign sub An fknR nS and effecting no change like boiling or freezing. The antiseptic action per sists long enough to prevent altera- ton.
 Diminution of glaciers within a half century has been noted in Spitzbergen. Iceland, Central Asia, the Rockies and Alaska Long experiment resulted q quarter of a century ago in the evolu- ton of Stefan's fourth power law" which suggests that the energy emit ted from a fully radiating surface--a surprace that is black when cold-is proportional to the fourth power of the temperature, reckoned from the abso- lute zero 273 degrees below freezing point on the centigrade scale. This law, states Prof. J. H Poynting. has served as the starting point of new and most fertile researches. both theoretical ana pTdCllCaA AAnOhB LhC NCAAtth ID the calculation that the suns tempera- ture Is 5000 degrees. and that e small black sphere-one square centimeter in cross section, would be heated by solar radiation to 1900 degrees at 3-3 mill lion miles. 32T degrees at 23,00O, 900 miles, BIO degrees at the distance of Mercury, S5 degrees at the distance ot Venus, 21 degrees at the distance of the earth, 30 degrees below zero at the
 aNA u.. low zero at the distance of Neptune. The earth's average temperature agrees closely with the calculation. On reduc- ing the size of the object receiving the radiation, the receiving surface is in- creased while gravitation remains the same, and if the earth were broken in- to spheres about 1-100.000 of an inch in diameter. the particles would be neither attracted nor reDeIled by the be repelied, like the matter of comets tails. t
 Iceland seems to be hardly as desti- tute of trees as some suppose. an old idea being that 1t possesses but a sim gle tree. An investigation by Prot. C. V. Prytz of Copenhagen shows that the island really contains woods hav- ing various trees Of considerable size anu tIAht tue Cttttatc tS not unIaVOTdOlG to the growth, as there is, evidence that It was once much moro heavily wooded than now. Reckless destrue- ton of the forestslis the cause assigned for the decline. Professor Prytz be- lieves reafforestation to be feasible. with care in the selection of trees and places of planting, and suggests pIant- ing around enclosed meadows ard on mountain sides. An attempt has been made already Co grow Denmark frs and pines at Hallormstaden. Birches spring up naturally. and where they are pro- tected by deep snows in winter it ia be- lieved sheep will not trouble tIsem, as these animals seem to eat hircnas only when grass Is not to be had.
 The density of several fruzan bases has been measured by Sir James Dewar at temperatures between Is ard II centigrade degrees above absolute. zero. He finds that the specific gravity of solid oxygen Is 1.425; solid nitrogen. 1,026, and solid hydrogen. COTS. A cu- rious fact is that if the clements oxy- gen and hydrogen occupied in water tke space they do in the solid state. a given weight of water would have a volume nearly twice as great as t actually does have.
 rAa traetivs resistance on railroads