4 



Blue of that service for many courtesies, including the use of 

 electrotypes; also to Assistant Surgeon-General William Colby 

 Rucker and Surgeon Richard M. Creel for photographs, and to 

 all these gentlemen and Passed Assistant Surgeon J. R. Hurley 

 for valuable and authoritative information. 



The small line cuts illustrating this bulletin were made from 

 pen sketches by Mr. Walt F. McMahon. 



