[ I9I ] 
of the day j though I have found it mofl frequent 
about noon, efpecially when the weather is mode- 
rately warm,- with the fun overcaft. The females, 
in a day or two after their intercourfe with the 
males, I have obferved to lay their eggs; which 
they ufually do near the buds, when they are left 
to their own choice. Where there are a number 
crowded together, they of courfe interfere with each 
other; in which cafe, they will frequently depofit 
their eggs on other parts of the branches, or even 
on the fpines with which they are befet. I do not 
however find that the eggs produced by thefe in- 
fedts bear any proportion to the number of young 
ones which proceed from the females of other gene- 
rations ; not having obferved any one infedt to pro- 
duce more than two or three, and that in appear- 
ance^with great difEculty. 
Having now traced .their 'progrefs through the 
different feafons of the year, and obferved the vari- 
ous metamorphofes which they fucceflively under- 
go; I cannot help fufpedting the infufficiency of 
human reafon, in fetting any fcheme to which the 
different changes of inledts. may be accurately re- 
duced. Though the indefatigable Swammerdam 
feems to have been fully convinced that there is 
no infed, whofe changes may not be reduced to one 
or other of the four orders he has defcribed ; fill I 
the infedl now under confideratlon, having at dif- 
ferent feafons quite different appearances, cannot, I 
think, with flridfnefs be confined to any of them. In 
the fpring they feem in fome meafure to coincide 
with the firft order, though in fummer thofe with 
wings more properly belong to the fecond ; but in 
autumn. 
