218 THE VITAL FUNCTIONS. 



or Privet Hawk-moth, in Figures 326, 327, and 

 328* ; the first of which is that of the caterpillar ; 

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

 that of the moth. The whole canal and its ap- 

 pendages, have been separated from their at- 

 tachments, 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 considerable 

 portion of the alimentary tube, and that it bears 

 some resemblance in its structure and capacity 

 to the stomachs of the Annelida, already de- 

 scribed.! 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 M 

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



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

 the Leech, p. 10'2 and 103. 



