10 PEESIDENTIAL ADDRESS BY PROFESSOE G. P. GIRDWOOD. 



will materially assist in determining the condition of matter in interstellar space and in 

 highly rarified vacua, and the effect of intense cold upon solid substances. 



From this imperfect and hasty résumé of some of the marvellous discoveries of the past 

 few years, we see how intimately blended all the divisions of science are, and how necessary 

 each is to the other, and how by one it is possible to correct the theories advanced by 

 another, and thus the general science benefited and secured on a firm basis of fact. 



