Arizona weekly citizen., 1882-10-08
Scientific GIeanings.

h writer m one of the scientific jour nals contends that the excess of nor tality n hot weather Is largely depend ent upon the heat evolved from the cooking stove, and that by utilizing that heHt as a means of ventilation much benefit might Se derived and the nor tshty lOwered.'
 Dr. Denker, of St Petersburg, treats diphtheria by first giving the patient a laxative, and when its operation has ceased he gives cold drinks scldulsted with hydrochloric acid and then gar gle of lime-water and hot milk ID equal parts every two hours. His method has been very successful.
 Professor A. A. Nicholson has nearly completed his preparations for a rein vestlgatiou of the velocity of light at the Cass School of Applied Sc1ences, Cleveland, Ohio. In 1879 he found that hght travelled at the rate of lS6,3sO miles a second-a resnlt which differs slightly from those obtained within late years by NJ. COrnu and Professor New comb.
 The Sanitary Engineer reports that smoke consuming engine, invented by Mir. hearDey, master mechanic of the St. Louis and San Francisco railway, IS being eIperlmented with ir Chicago satisfactorily. The draft is downward, throwing the cinders and smoke back into the fire box to be consumed. In the experiments thus far made there has been, 1t IS said, q saving of about 5O per cent of fuel.
 NM. SchulhofF and Bosseri consider the period of the comet Of 1912 to Oe I7.7 wears, or one year longer than that assigned by Encke, who first proved the lmpOssIbilty of representing the data of observations by psrabola. Taking into consideration the effect of plane rary perturbation since the last appear ance of this comet, they believe it req suuable to suppose that the summer of 1883 will see it at perlhellCn.
 A dIspatch from the Observatory at Paris relative to the large comet now visible in the morning m the east, says: The nucleus gives continuous spec trum. very brilliant and very much ex- tended toward the violet. Both tail and nucleus give the sodium lines extreme brilliant, very sharply divided, and characteristics. They seem displaced toward the red The spectrOsc0pe observations reported in the above dispatch are of extraordinary interest. They indicate that this Is the second comet that has shown sodium spec trum. The first was that discovered ttis year by Wells, at Dudley Observa- tory, and observed at that institution in full daylight. The reported displace ment of two sodium hnes toward the red end of the spectrum Is of the highest interest, since 1t indicates that the comet IS now moving towards the earth with planetary velocity. Such an Obser- vatIon has never before been made Tn the case of any comet. The comet is nov ing westw ,rd from the sun at the rate of five or six degrees daily. It IS al- ready certain that the comet bas now passed its perihelioD, or point where it is nearest the sun. Astronomers will now be anxious to learn if this comet IS identical with the one recently dis covered in South America. If this iden- tity is proved, 1t will follow that it has approached very near the sun probably as close as did the great comet of lSS0-the comet which has the smallest perhelion distance on record. One the whole, this may be regarded as on of most extraordinary comets of modern times. The only one which resembles 1t in it's special features of interest IS the great comet of lS43, which like this one, was visible to the naked eye in full sunlight