q 
terpillars, when newly hatch’d, are fociable, and keep together for about three Weeks, after 
which Time they féparate and are difficult to be found. The moft certain Food to take them 
on is the Black Thorn, and of that fuch as is not of above two or three Years Growth. They are 
ufually found on Twigs about one or two Feet from the Ground, and (as I lave obferved) 
herd in Clufters together, when they are in their firft, fecond and third Skins.-On the 12th 
of May 1745, I had about fixty Caterpillars hatched from fuch Sort of Eges us are expreffed 
round the Black Thorn in the Plate: On the 19th they appeared in their fecond Skin; on the 
as5th, in their third; on the 18th of fame, in their fourth, and, on the 22d, in their fifth 
The Caterpillars grew fo much in this Skin in four Days, that they were three Times as big — 
as when full fed in their fourth Skin. On une the 30th, they fhifted into their fixth and laft 
Skin; in which Skin (as well as in the former Skins) fuch as appear moft Green are the fe- 
male Caterpillars. On the 12th of uly fome of them began to fpin Cafes, in order for their 
Change into the Chryfalis State; and, on the 26th, the whole threefcore had {pun themfelves 
up. ‘Thus they remained throughout the Winter, and, from the 16th to the 3oth of April 
following, I had forty of the Moths bred; but the Reft of the Aurelias did not produce their 
Moths tillthe Year following ; So that about twenty of my Number were in the Chry/alis 
State near two Years; and yet produced Moths at laft that were equally beautiful and large. 
The Female lays from 250. to 300 Eggs, in fuch Manner as is reprefented in the Plate, and 
thefe fhe hides in three or four diflerent Places for the more certain Security: of fome of them. 
The Cafe which contains the Chry/alis is well worthy Notice, being compofed of a giuten- 
ous Matter fitMo refift all Kinds of Weather; and, for its greater Security, that Part which 
I call the Mouth is doubly guarded: So that, - any Infe@ fhould chance to force the firft 
Fence, it will there meet with a fecond Refiftance, and that of fo ftrong a Nature, from its 
paiticular make, that I am apt to believe few, if any, can ever enter; and thus the Chryfalis 
is preferved in the moft fecure and wonderful Manner, as will be better underftood by at- 
tending to the BIg oe in the Plate. The Moth is very feldom taken i in the 
Fly State. 
The Black Thorn. 
Prunus Syboeftris, _ Ger, 
L.1. Cu. 1, pies Ci. 2. Soa 2. 
VA L S Plate ate the Male and Female of the EMPEROR-MOTH, of 
which T have already given an Account. 
See Merian, Vol. 1. Ch. 23. Albin, Pl. 25. Rofel, Cl. 2. Tab. 4, 5s Reaumur, Pl. 49 and 
50 Pag. 554. Vol. 1. 
The White Fruit-bramble.. 
Rubus vulgaris major, fruttu albo, Rai. Syn. . 
IV 
