[ 3°i ] 
Monfieur de Reaumur has repeated the Experi- 
ments of Malpighi, and made feveral new ones up- 
on this Subject. And he has been of Opinion, that 
thefe Apertures ferved only for the Infpiration of 
the Air, which the Caterpillar afterwards expired, 
through the whole Supeihcics of its Body. What 
he has wrote upon this Subject is in the firft Tome 
of his Memoirs, at the 131 st and the following 
Pages. 
Mr. Bonnet has had Reafon to think thefe Ca- 
terpillars do both infpire and expire the Air by their 
Stigmata ; and that they did not expire any of it 
through the Pores of their Body. This Paper here 
Ihewn gives an Account of 36 feveral Experiments, 
made chiefly with Defign to difeover this Fafr, 
whether indeed thefe Infers did both infpire and 
expire the Air by their Stigmata , or only infpire 
it. Thefe Experiments, like Mr. de Reaumur , con- 
flft moftly in the plunging of Caterpillars either 
into Water, or fome other Liquor; fome alfo they 
daubed or anointed over with fat and greafy Sub- 
ftances, fome quite over, and others only in fome 
Places. 
Mr. Bonnet is inclined to think, that the Email 
Bubbles of Air obferved all over their Bodies, when 
they are immerged in Water, do not come from 
the Air included within them, and which they ex- 
pired by the Pores ; but that they are formed by the 
Air only lodged near the Surface of the Skin of 
the- Caterpillar, as it is about the Superficies of all 
other Bodies: He has endeavoured to contrive it fo, 
as that no Air might remain thus flicking to the 
Skin of thofc Infers upon which he has made 
; R r thefe 
