REPOKT OF THE SECRETARY. 105 



sciences, which have in the last few years advanced with such un- 

 precedented strides. The inckision of papers dealing with the ap- 

 plication of scientific discoveries would undoubtedly greatly increase 

 the size and cost of the Catalogue, but on the other hand its value 

 and use would be so increased that the demand and consequent sales 

 of the Catalogue would more than offset any additional cost. 

 Very respectfully, yours, 



Leonard C. Gunnell, 



Assistant in Charge. 

 Mr. Charles D. Walcott, 



/Secretary of the SmltJisonian Institution. 



