[ 4<fi ] 
But I have obferved it in all thofe Caterpillars 
which, from the Figure and the StifFnefs of their 
Hairs, have been called the Thorny-one s. The Ufe 
of this Part remains yet unknown to me : All that I 
know, and that I have learnt by my Experiments, is, 
that it is not efiential to the Caterpillar. 
V. Caterpillars are of thofe Infects for which one 
has naturally fuch an Averfion, that it will eafily be 
believed there are fome that have an offenlive Smell ; 
and I have a&ually obferved a fmall Kind of them 
that fmell fo like a Bug, that I have thought fit to 
give them that Name. But what perhaps will appear 
more Orange, is, that there is alfo a fort of a middling 
Size, which are fmooth, and on the Approach of their 
Metamorphofis, have a very fweet Rofe like Scent j 
and whole Cafes, being made of Earth and of Silk, 
preferve that Smell for Years together. The But- 
ter jlie of another Caterpillar *, of the middle Size 
aifo, but hairy, gave, upon its coming out of its Cafe, 
a very fenfible Scent of Musk. 
Of the Formica-Leo. 
I. There are few Infe&s that have been fo much 
and fo defervedly admired as the Formica-Leo. 
That excellent Work the Spectacle de la Nature 
has been fo univerfally read by the Curious, as hardly 
to let any one be ignorant of its Hiftory. However, 
a little Particular, curious enough, has yet efcaped 
the mod diligent Inquiries j and that is the Manner 
in which he goes to work, when he finds Stones in 
* Memories fur les Infe&es, Tom. I. PL 1 6 . Fig. 8. 
his 
