218 THE VITAL FUNCTIONS. 



or Privet Hawk-moth, in Figures 326, 3*^7, and 

 328* ; the first of which is that of the cater- 

 pillar ; the second, that of the chrysalis ; and the 

 third, that of the moth. The whole canal and 

 its appendages have been separated from their 

 attachments, and spread out, so as to display all 

 their parts ; and they are delineated of the 

 natural size, in each case, so as to show their 

 comparative dimensions in these three states. 

 In all the figures, a is the oesophagus ; b, the 

 stomach ; c, the small intestine ; d, the caecal 

 portion of the canal ; and e, the colon, or large 

 intestine. The hepatic vessels are shown at f ; 

 and the gizzard, which is developed only in the 

 moth, at G, Fig. 328. 



It will be seen that in the caterpillar, (Fig. 

 326), the stomach forms by far the most consi- 

 derable portion of the alimentary tube, and that 

 it bears some resemblance in its structure and 

 capacity to the stomachs of the Annelida, already 

 described.-f This is followed by a large, but short, 

 and perfectly straight intestine. These organs 

 in the pupa (Fig. 327) have undergone con- 

 siderable modifications ; the whole canal, but 

 more especially the stomach, being contracted 



* These figures also have been engraved from the drawings of 

 Mr. Newport, which he was so obliging as to make for me, from 

 preparations of his own, the result of very careful dissections. 



t See the figures and description of those of the Nais and the 

 Leech, p. 102 and 103. 



