E.. B. Hunt on the Nature of Forces. 237 
fer for the details and proofs in relation to many points which 
have been stated in this paper. In concluding, I would express 
my warmest thanks to Mr. Charles W. Eliot, Tutor in Harvard 
College, and Mr. Charles S. Homer, assistant in my laboratory, 
or their assistance and zeal in prosecuting the investigation. 
Their names have already appeared in the course of the paper. 

Arr. XXX.—On the Nature of Forces ; by Lieut. E. B. Hunr, 
| Corps of Engineers, U.S, A.* 
-deeite 
Neither increase nor diminution by outward transmission. If any 
other than the inverse duplicate ratio be supposed, it must involve 
Y, Read before the American Association for the Advancement of Science, at 
1854, 
ashington, May, 
