[ xl J 
the leaves depends upon too many 
circumftances to be conftantly of. 
the fame quality. Some more or 
lefs light of the fun thrown upon 
the jar will make fome differences 
. the leaves bein g more or lefs crowded 
together, will make a remarkable 
difference, as a great number of 
them may be fhaded from the fan 
by others. , 
_ As I made the greateft part of 
my experiments according to the 
prefent method of proceeding” of 
my refpectable friend the Abbé 
For | it gould pay been OES 
teed in ‘this aE Sd even” to 
underftand the manner in which 
they were made, if he had not 
given me leave to anticipate the 
publication of his own ingenious 
CODER anES and of his prefent me- 
—thod 
