"+ Prof. Treadwell’s Improvements in Cannon. 97 
Art. XV.—Professor Treadwell’s Iniprovements in construeting 
Cannon ; Address of the President of the American Academy 
of Arts and Sciences (Prof. AsA Gray) upon the presentation 
3 Rumford Medal to Professor TREADWELL, November 15, 
5. 
[Extr. from the Proceedings of the American Academy, vol. viii.] 
of heat. This medal is now before us. It is the first which the 
e. 
earliest communication,—a pamphlet published in. the 
Plements of destruction, may be questioned. We need have no 
theese in this respect. So long as life and property, which 
Possessions, they may be justly yielded and taken, if need re- 
quire, for the preservation of those that are. ri ag ss a 
et always count among their greatest bene 
1 
