316 ANIMAL REPRODUCTIONS. 
aphides, gall infects, wheel animals, libellula, 
artificial fecundation, and fo many more whee 
rather feem poffible than true. 
How far have thofe departed from real philo- 
fophy, who have called the reproduction in quef- 
tion, before endeavouring to verify it! Preju- 
dices, whether favourable or unfavourable for any 
fyftem, theory, or hypothefis, are in general fatal 
to obfervation. When we interrogate nature, it 
muft be divefted of all prejudice and paffion, 
which obfcures the fair face of truth; and, with 
an amiable indifference, we ought to judge 
equally againft others as ourfelves. If, on the 
contrary, we are prepoflefled with withes, dif- 
truft, and doubts, we fhall behold experiments 
from the fide favouring our defire, and not from 
that adverfe to it. Our opinions will be incor- 
rect; and, inftead of adding ufeful facts to phi- 
lofophy, we fhall increafe the number of errors. 
EXPERI 
