41 



What has happened in the iron industry has happened also 

 in a great variety of other industries. To speak of the different 

 hnes in which chemists are today employed would be almost to 

 give a list of the important industries of the country. There 

 is in these and in chemical work in general a rapidly increasing 

 diversity. During the past year the American Chemical So- 

 ciety has established an abstract Journal which intends to give 

 an account of all new work in chemistry which is published in 

 the world. The abstracts in this journal are classified in thirty 

 divisions, and this illustrates the great variety of industries and 

 directions in which chemists are interested. 



The amount of knowledge which has been accumulated in 

 chemical science is so great that I feel safe in saying that the 

 detailed knowledge in this science is greater in amount than 

 the whole mass of scientific knowledge in all sciences fifty 

 years ago. I do not, of course, mean that the value of this 

 chemical knowledge is greater than the value of the scientific 

 knowledge fifty years ago, but merely that its amount is 

 greater, and I say this for the purpose of emphasizing the di- 

 versity of interests among chemists. 



It is estimated that there are about eight thousand chemists 

 employed in the United States at the present time. One of 

 the previous speakers has referred to an estimate that there 

 are only five thousand scientific men in the United States. 

 While I do not suppose that all of the eight thousand chemists 

 can be properly classed as scientific men in the sense in which 

 the term was used by the former speaker, I am inclined to 

 think that this number indicates that there are many more 

 scientific men in the United States than would correspond to 

 that estimate. The increase in the number of chemists during 

 the past twenty-five years has been very largely occasioned 

 by the employment of chemists in the industries. A quarter 



