ADDITIONS TO CHAP. I. 
OF THE CHANGES INDUCED ON THE AIR BY 
THE GERMINATION OF SEEDS. 
* 200. .1 N our former publication, we distinctly 
considered the operation of water, heat, and air, in 
promoting the germination of seeds ; and the con- 
clusions to which we then came are, for the most 
part, acquiesced in by chemists. The facts, indeed, 
on which they rest, are so numerous and precise, as 
scarcely to leave room for any difference of opinion 
respecting them. Such additional evidence, however, 
as we have since been able to collect in their support, 
we shall now briefly notice, preserving, as nearly as 
we are able, the arrangement observed in our for- 
mer treatise. 
201. The presence of water has been stated (1.) 
as one of the first agents required for the commence- 
ment of the germinating process ; and the force 
which seeds, by imbibing it, are capable of exerting, 
is well illustrated in some experiments made by Mr 
9 This and the following numbers are continuations of those 
which mark the paragraphs in the former publication. 
