1892.] on Magnetic Properties of Liquid Oxygen. 699 



required some qualification because a photographic plate placed in 

 liquid oxygen, could be acted upon by radiant energy, and at a tem- 

 perature of -r- 200° C. was still sensitive to light. 



Prof. M'Kendrick had tried the efi'ect of these low temperatures 

 upon the spores of microbic 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. 

 He thought, therefore, that this experiment had proved the possibility 

 of Lord Kelvin's suggestion, that life might have been brought to the 

 newly-cooled earth upon a seed-bearing meteorite. ^ 



In concluding, the lecturer heartily thanked his two assistants, 

 Mr. K. N. Lennox and Mr. J. W. Heath, for the arduous work they 

 had had in preparing such elaborate demonstrations. 



[J. D.] 



