1873.] SENATE— No. 252. 9 



instructions to all political and consular agents of the United 

 States Government, as well as to all naval officers, to render 

 any assistance to the expedition not inconsistent with their 

 regular service, and I had constant cause to acknowledge 

 their cordial good-will and cooperation. But we were no less 

 indebted to private mercantile companies, railroad and steam- 

 boat corporations and to private individuals. As soon as the 

 special returns are handed in to me by the assistants in 

 charge of the different collections, I shall publish a nominal 

 account of all these favors. 



It was, however, to the captain and officers of our own 

 vessel that I was especially indebted. Not only did they put 

 at my disposition every facility for the work of collecting, but 

 they were untiring in fishing, hunting and dredging, and to 

 their individual efforts I owe many of the most valuable 

 specimens we have brought home. I wish every naturalist 

 might have as valiant co-workers as I found in my friend 

 Capt. P. C. Johnson, Lieut. Charles Kennedy, executive 

 officer of the Hassler ; Lieut. Day, navigator of the Hassler, 

 Lieut. Mansfield, Lieut. Remy and Dr. Pitkin, U. S. sur- 

 geon. To Dr. White and to Dr. Hill, physicists, I was also 

 indebted for most important assistance. Under all the diffi- 

 culties of photography at sea they succeeded in getting some 

 illustrations of scenery and of specimens which will be valu- 

 able in the working up of our results, and Dr. Hill was 

 indefatigable in the collecting of seaweeds and plants, and 

 has brought back to Cambridge a very interesting and rare 

 botanical collection. 



I cannot close this Report without an expression of my deep 

 sorrow at the loss of the Rev. J. B. Perry, assistant in the 

 Palaeontological Department. Mr. Perry was one of the most 

 devoted and industrious collaborators I ever had ; and his at- 

 tainments were so comprehensive that his place will never be 

 filled in the Museum. 



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