BOMBYX MORI. 471 



pillar-state ; but, in a few hours before this change, they appear to 

 acquire a considerable size. 



Of the internal additions and changes. — The stomach is filled with a 

 yellowish transparent ropy mucus, which very probably supports the 

 animal in the chrysalis state, and the gut-part of the canal becomes 

 one straight tube to the anus, and there increases and forms itself into 

 a bag. 



The white substances, like bits of fat, before mentioned, are increased 

 in quantity, or appear to be so, from their being brought into a small 

 space, especially at the anterior end. The parts of generation in both 

 sexes are now formed, although, to appearance, imperfectly. The 

 vessels, which are black, and ramified on the stomach, silk-canals, &c, 

 whose origins are at the dark spots on the side, appear now to have 

 thrown back their whole contents into the communicating canal on the 

 side, making the line black, which we observed was thrown off with 

 the cuticle, and which tubes appear now almost transparent. The silk- 

 tubes are much diminished \ 



In the change from the caterpillar to the chrysalis, the antennse, 

 wings, and feet are denuded, and are at this time very wet ; they fall 

 down close to the body, and seem to exude from their surface a mucus 

 which hardens or dries, and forms a coat for them, the whole being 

 something like a hood and lappets laid over the breast. When all 

 these changes have taken place, they are then in the chrysalis state, 

 and of a veiy different shape from the caterpillar ; and in this state the 

 insect remains, having but few external changes, either in form or 

 appearance, until it emerges a moth. 



Of the external changes of the chrysalis. — "We can observe the eyes 

 becoming dark, the antennas becoming darker, and their annular struc- 

 ture appearing through the chrysalis sheath. The wings are taking on 

 their proper colours, which are also seen through the chrysalis sheath, 

 and they are becoming firmer in texture. While in this state, a new 

 skin is forming on the inside of the present ; but at first it is so obscure 

 as hardly to be perceptible : before a complete separation has taken 

 place, we find its union to the chrysalis skin to be at the joints : upon 

 this new skin the hair is formed. 



Of the internal changes. — A new structure is going on in the fore-part 

 of the animal; a thoracic as well as an abdominal part is forming; 

 there is a kind of partition to divide the thorax from the abdomen, also 

 a harder structure as a basis for the feet and wings to act upon, which 

 is the thorax. On the inside of the belly the. following things are 

 taking place. The white substances, like bits of fat, appear to be 



1 [Hunt. Prep. No. 2989.] 



