LETTER OF TRANSMITTAL. XV 
known botanical artist, Isaac Sprague, of Cambridge, Mass., and Mr. W 
H. Seaman, of the Agricultural Department. 
It is with pleasure that this opportunity is taken of recognizing the 
industry, perseverance, and skill shown by those whose combined labors 
have made collections the results from which are embodied in the reports 
herewith submitted. 
Very respectfully, yours, 
GEO. M WHEELER, 
Lieutenant of Engineers, in Charge. 
Brig. Gen. A. A. Humpureys, 
Chief of Engineers, United States Army, Washington, D. C. 
