TRACTS ON VARIOUS SUBJECTS, &c. 6U 



particle of vesetable substance remaining ; the only difference 

 was, that No. 4 was occasionally watered. 



It was on the 10th of September last, that twenty-four grubs 

 were put into each of the boxes; on the 14th, I examined them 

 as follows : 



No. 1. — Grubs fat and lively. 



No. 2.— Ditto ditto 



No. 3. — Some grubs dead, others of a blackish colour ; thin and 

 sickly. 



No. 4. — The same as No. 3. 



On the 17th, I again examined them. 



No. 1 . — Some as healthy and vigorous as at the time they were 

 put in the box. 



No. 2. — Some healthy ; but in general fallen off. 



No. 3. — Some dead ; the rest miserably thin and shrivelled ; 

 and of a darker colour. 



No. 4. — Some dead ; but in general better than No. 3. 



On the 23d of September, observing in No. 1 a ball of clay, 

 about the size and shape of a small walnut, and not knowing 

 what it was, I broke it, and accidentally destroyed a chrysalis, 

 the inside of which was filled with a liquid resembling cream. I 

 afterwards found that it is in this manner the grubs surround 

 themselves with soil when they begin to perceive the approaches 

 of transformation. 



On the 1st of October, the grubs fed in boxes. No. 1, and 2, 

 were still rat and thriving; but in the starvation boxes very few 

 remained alive. 



On the 13th of October, a chrysalis had been formed in box 

 No 2 : there might have been more ; fori did not, until the 23d, 

 empty the boxes, in order to ascertain the state of the grubs. On 

 that day it was as follows: 



