SECT. XXXIX. 4. GENERATION. 573 



who changes from an aquatic animal furnifhcd with 

 gills to an aerial one furnilhed with lungs. 



The numerous tribes of infedls without wings, 

 from the fpider to the fcorpion, from the flea to the 

 lobfter ; or with wings, from the gnat and the ant 

 to the wafp and the dragon-fly, differ fo totally from 

 each other, and from the red-blooded clafles above 

 defcribed, both in the forms of their bodies, and 

 their modes of life; befides the organ of fenfc, 

 which they fecm to poiTefs in their antennas or 

 horns, to which it has been thought by fome natu- 

 ralifts, that other creatures have nothing fimilar ; 

 ihat it can fcarccly be fuppofed that this nation of 

 animals could have been produced by the fame kind 

 of living filament, as the red-blooded claifes above 

 mentioned. And yet the changes which many of 

 them undergo in their early ftate to that of their 

 maturity, are as different, as one animal can be from 

 another. As thofe of the gnat, which pafles his 

 early ftate in water, and then ftretching out his new 

 wings, and expanding his new lungs, rifes in the 

 air ; as of the caterpillar, and bee-nymph, which 

 feed on vegetable leaves or farina, and at length 

 burfting from their felf-formed graves, become beau- 

 tiful winged inhabitants of the ikies, journeying 

 from flower to flower, and nourifhed by the ambro- 

 fial food of honey. 



There is ftill another clafs of animals, which are 

 termed vcrmes by Linnaeus, which are without feet., 

 or brain, and are hermaphrodites, as worms, leeches; 

 fnailsjfhell-fifti, coralline infecls, and fponges ; which: 

 poifefs the fimpleft itrudure of all animals, and ap- 

 pear totally different from thofe already defcribctL 

 The fimplicity of their ftrudure, however, can af- 

 ford no argument againft their having been produced 

 from a living filament as above contended. 



Lail of all the various tribes of vegetables arc to 



'V enumerated amongft the inferior orders of arii- 



P p 2 vnals, 



