BOOK II PART I
humours and the composition of minute parts
may justly be presumed so be somewhat differ-
ent in men from what it is in mere animals; and
therefore any experiment we make upon the
one concerning the effects of medicines will not
always apply to the other; yet as the structure
of the veins and muscles, the fabric and situa-
tion of the heart, of the lungs, the stomach, the
liver and other parts, are the same or nearly the
same in all animals, the very same hypothesis,
which in one species explains muscular mo-
tion, the progress of the chyle, the circulation of
the blood, must be applicable to every one; and
according as it agrees or disagrees with the ex-
periments we may make in any species of crea-
tures, we may draw a proof of its truth or fal-
shood on the whole. Let us, therefore, apply
this method of enquiry, which is found so just
and useful in reasonings concerning the body,