20 SCIENCE 



years later by Le Chatelier to construct a 

 thermocouple for the measurement of tem- 

 perature in metallurgical processes. Applying 

 these two instruments of research, metallur- 

 gists have now a clear idea of the structure of 

 the more important metals and alloys used in 

 industry and of the manner in which the pro- 

 perties which fit them for their various uses 

 are related to that structure. The intensive 

 study of pure science, the determined effort 

 to hand on still brightly burning the lamp 

 lighted for us by those who have gone, is 

 perhaps the best contribution which Cam- 

 bridge now can make to our national welfare. 

 "Science," writes Professor Bragg, "grows 

 like a tree which shoots out new branches 

 continually and at the same time strengthens 

 the old ; twigs become boughs and the boughs 

 become great stems, while the tree is ever 

 growing upwards towards the light and more 



