Dr. Bostock on Evaporation. 



313 



■with great care, and that their results were always accurately re- 

 gistered at the time they were performed ; they may, therefore, be 

 useful as matters of fact, and more especially as viewed in connexion 

 with your valuable researches on meteorology. The number of ex- 

 periments which I have on record is 162; some of these are, from 

 various circumstances, more or less imperfect, yet there are 130 

 ■which I think are not liable to any exception, and which I have, 

 therefore, employed in forming- the general conclusions. 



It is not my intention to trouble you with the relation of all these, 

 but I shall select a few, which may be taken as a specimen of the 

 manner in which they were conducted, and I shall afterwards en- 

 deavour to form some kind of synoptical view of the whole. 



The three following series, consisting each of ten experiments, 

 are selected from different parts of the journal, as showing the state 

 of evaporation in the months of December, May, and August. 



Vol. XVIII. 



