and the ravage made often on several sorts of animals by invisible causes, the certain death (as we are told) of some of them, by barely passing the line, or, as it is certain of other, by being removed into a neighbouring country; evidently show that the concurrence and operations of several bodies, with which they are seldom thought to have anything to do, is absolutely necessary to make them be what they appear to us, and to preserve those qualities by which we know and distinguish them.
eta kausa ikusezinek sarri animali espezie batzuei eragiten dizkien asaldurak eta animalia batzuk (esan digutenez) lerroa pasatze hutsagatik hutsik gabe hiltzeak edo beste batzuei gertatzen zaien moduan inguruko beste herrialde batera iragateagatik hiltzeak argi erakusten digute uste dugunez haiekin inolako zerikusirik ez daukaten gorputz ezberdinen eragina, baita eragiketak erabat beharrezko direla ere gorputz horiek guri agertzen zaizkigun modukoak izateko eta haiek ezagutu eta bereizteko bide ditugun koalitateei iraunarazteko.