2. In order that all things may succeed each other in proper order, it is necessary to set out from general principles; consequently, from the blood, in which, as a type, we discern the several parts of which we are to treat. For on the nature, constitution, determination, continuity, and quantity of the blood, depend the fortunes and condition of the animal life. The vessels, namely, the arteries and veins, are only the determinations of the blood; and such as is the form resulting from their coalition and complication, such are the common forces and vital effects of the system, and such their particular qualifications.
