MAGNETIC PROPERTIES OF LIQUID OXYGEN. 187 



radiant euergy, and at a temperature of — 200° C, was still sensitiv^e 

 to light. 



Prof. M'Kendrick liad tried the effect of these low temperatures 

 upon the spores of mierobic organisms, by submitting" in sealed glass 

 tubes blood, milk, flesh, and such like substances, for one hour to a 

 temperature of — 182° C, and subsequently keeping them at blood 

 heat for some days. The tubes on being opened were all putrid. 

 Seeds also withstood the action of a similar amount of cold. 



[At a meeting of the Royal Society of London, held March 0, 1893, 

 Professor Dewar made an oral statement to the effect that he had suc- 

 ceeded in freezing liquiiied atmospheric air into a clear transparent 

 solid. Whether this solid is a jelly of solid nitrogen containing liquid 

 oxygen, or a true ice of liquid air, in which both oxygen and nitrogen 

 exist in the solid form, was however stated to be a question for far- 

 ther research. — rroceedings of the Royal /Societt/y 1893, vol. Liii, p. 80.1 



