C 2II ] 
it more excufable to be prolix than not fufficiently 
explicit. 
London, 
- March 21, 1771. 
J. Smeatpn. 
P. S. It is to be noted, that, after each readjuft- 
ment, though the hygrometers would generally with- 
in a few hours come near their point, yet it was 
not till the next day that they could be depended on, 
as having come to their neareft agreement. 
XXV_. Lettev^ 
E e 2 
