Oxygenation of Snow and Rain, 317 



the gas in the upper end of the tube. The tube mufl now be 

 left inverted in the veflel filled with water, in which it muft 

 remain. The phofphorus will undergo a flow and gradual corn- 

 bullion : by nieans of the thread the cork from time to time 

 may be drawn under the water to wafn off the acid produced 

 by the combuftion, and, adhering to the phofphorus, to haftea 

 the procefs. When all the oxygen gas is confumed, and the 

 remaining phofphorus is no longer obferved to iliine in thf! 

 dark, the cork muft be drawn out ; and the obferver muft 

 rote, at a correfponding height of the barometer and degree 

 of heat with that of the atmofphere when tiic fr>.cci3 com- 

 menced, the quantity of azot remaining, and how much 

 oxygen has been confumed. 



METHOD OF PROVING WHETHER COTTON BE ADUL- 

 TERATED AVITH WOOL, or I'tce vcrfa. 

 You may eafily afcertain whether cotton is mixed with 

 wool, by fubjeiling it to the a6lion of the oxygenated mu- 

 riatic acid, which will render it white, at the fame time that 

 it makes the wool yellow. Profoflbr Brugman, of Leyden, 

 has by the fame means been able to determine with cer- 

 tainty what part in the brain is the medullary fubftance, 

 and what part the nerves ; and to difcover the latter even ^t 

 their origin, where mofl concealed. 



OXYGENATION OF SNOW AND RAIN, 



In our lad volume, page 333, we gave a paper by 

 "!M. Ilalfcnfratz on the oxygenation of fnow and rain, and 

 their eflecls on vegetation. In that paper M. Haffenfratz 

 divides the aft ion of fnow into parts, ift. As preferving 

 plants from the great cold of the atmofphere ; ad, as cauf- 

 ing a greater number of feeds to expand by means of the 

 oxygen with which it fupplics them. M. HafTenfratz 

 proved the prefence of oxygen ir) fnoW by its rendering 

 turnfol paper red, and precipitating oxyd of iron from a fo- 

 luUyn of the fulphat of that nactil, Dr, Joachim Carradori 



