[ si i 



the light of the fun, the firft ready 

 to operate ; when thofe of the op- 

 polite fide of the tree, fhaded by the 

 firft, were frill in their ftate of 

 ftupor. 



A ready way to know this time 

 exactly is to put a leaf or two, from 

 the plant you are to examine in 

 this refpect, in a glafs full of frefh. 

 pump- water, and to obferve, whe- 

 ther the bubbles appear upon theni 

 about as t quick as they ufe to 

 do in the full day time. If they do, 

 you may be fare they are fit for 

 the bufinefs. 



But there is a readier way to 

 know exactly this article of time, 

 which I found by the water in the 

 jar in which the green matter, dis- 

 covered by Dr. Prieftley, is already 

 formed. The doctor found that 

 this green matter yielded air bubbles 

 G only 



