106 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1917. 



precedented strides. The inclusion 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. Gun NELL, 



Assistant in Charge. 

 Mr. Charles D. Walcott, 



Secretary of the Smithsonian Institution. 



