THE CABBAGE BUTTERFLY. 89 



Observe the effect on them of wet weather and of dry ; 

 of hot weather and of cold. 



Collect larvae of all sizes, and keep them supplied with 

 cabbage leaves until wanted for further examination. 



3. Pupce or chrysalides. These have an angular, chi- 

 tinous case, something less than an inch long, and pale 

 and inconspicuous. One will occasionally be found at- 

 tached to a cabbage leaf, but more often to the under side 

 of a fence board, or to a post some few yards distant from 

 the cabbages. There is little or no attempt at conceal- 

 ment; but, if one be 'not found readily, it may easily be 

 obtained in a few days by keeping in confinement a few 

 full-grown larvae, and this will afford opportunity for ob- 

 serving the transformation. For this purpose a few of 

 the largest larvae (they should be more than an inch long) 

 may be placed in an ordinary jelly glass, with pieces of 

 fresh cabbage leaves, covered with the tin top to prevent 

 the drying-up of the leaves, and left there until the trans- 

 formation takes place. 



When a chrysalis has been obtained, note its location 

 and attachments. At its posterior end is a circlet of 

 hooks, called a cremaster, fastened firmly into a button 

 of silk that was spun by the larva. Around its thoracic 

 region is a supporting loop of silk attached at both ends 

 to the support above. How does a thing so inert become 

 suspended in such a peculiar fashion ? 



4. Imagoes. These should be obtained from the chry- 

 salides. All that is' necessary is the keeping of the chry- 

 salides in a moderately warm place, and in a good place 

 for observation, for a short time. This will be advan- 

 tageous on two accounts : (1) it will afford an opportunity 

 for observing the final transformation, the rupture of the 

 chrysalis, the emergence of the imago, and the expansion 

 and drying of its wings, a truly wonderful transforma- 

 tion, that ought to be seen by every one ; and (2) it will 



