126 THE BUTTERFLY VIVARIUM. 



near Brentwood, in Essex." Mr. Drury appears to 

 have thus captured four caterpillars, which were 

 entirely new to him, and to have presented thern 

 to Moses Harris as the person most likely to rear 

 them successfully. " They were," says our author, 

 " different from any hitherto discovered, being 

 furnished with two horns like the telescopes of the 

 snail." He then describes very minutely the food he 

 gave them, their growth, and their eventual change 

 to the pupa state, stating that the chrysalides were 

 of a "bright pea-green with a bloom of peach 

 colour." After many other particulars concerning 

 one of these cherished chrysalides, he says, " on 

 the 22nd of June, 1758, at eight in the evening, 

 to my unspeakable pleasure it produced the Purple 

 Emperor;" and he proceeds at once to express 

 his unbounded gratitude to Mr. Drury, giving to 

 that " ingenious gentleman" the credit of having 

 enabled him to discover " the caterpillar of one of 

 the most beautiful flies in the universe, which had 

 hitherto escaped the search of the most skilful 

 and industrious Aurelians." 



The enlargement of the little wings with which 

 a Butterfly first issues from its chrysalis, as the 

 phenomenon must have been noticed by Moses 

 Harris, is amazingly rapid, but it varies in different 



