156 On the Caterpillar which 



on either side of the bowel. Each has a tendon reaching 

 up to the neck, and also one descending to the tail ; at 

 which points they are firmly implanted. These mus- 

 cles, no doubt, serve as instruments of motion, in the 

 various acts of progression in which the animal is fre- 

 quently engaged. The tendons, having their implanta- 

 tion at the head and the tail, and the muscular portions 

 having folds, must admirably accommodate the animal 

 in its travelling. Are these muscles ultimately trans- 

 formed into wings ? 



The vascular system is, as to the animal, transverse. 

 It comes out by pairs, like the nerves of the human body, 

 and in bundles from the holes (stigmata) of respiration. 

 The holes are placed along the sides, near the belly, and 

 are numerous. They probably are in the place of lungs, 

 and serve to oxygenate the blood. The bundles of vessels 

 anastomose mutually with each other, and run chiefly 

 between the bowel and the back. A few are longitudi- 

 nal, connecting in their course branches of the various 

 bundles. But there does not appear to be any one 

 common vessel (aorta), from which the smaller ones 

 might branch out, or into which they might be collected. 

 There is neither heart nor brain discoverable on the mi- 

 nutest dissection ; but from the sensibility of the ani- 

 mal, there must be a nervous system, although I could 

 not discover it, either by the naked eye, or the eye aided 

 by such glasses as I could procure. In the human body 

 there is much which is discovered by great labour and 

 attention only, although upon a much larger scale. And 

 much we suppose may, and must, or we could not ac- 



