at different periods of the Day. 261 



I think no physiologist could have anticipated such results as 

 these. They are in fact so much at variance with what could 

 have been expected, that I should have been inclined to doubt the 

 accuracy of the observations themselves, if I did not know that 

 they were conducted with most scrupulous exactness, and by the 

 method already described in my former report, (see page 103.) 

 This seems as little open to error as any plan that could be con- 

 trived, and I have no doubt of its being a true representation of the 

 facts as they occurred. 



It therefore seems more than ever certain, that the conclusion 

 to which the former observations pointed was correct, namely, that 

 some agent, distinct from heat, light, or moisture, is in operation, 

 the nature of which we have at present no means of ascertaining. 



