98 ANIMALS AND VEGETABLES III, 
ralifts. They are in conftant motion, darting 
through the water in various directions (1), Se- 
veral thoufands lived two days and fome hours in 
a receiver, and died without any fenfible eleva- 
tion of tHe water. Neither could I perceive any 
elevation of water full of animalcula, which died 
in two weeks. f 
My experiments on many infects which undergo 
no metamorphofes, as fpiders, fhell and naked 
{nails, millipedes, and on others that change their 
form, as caterpillars, chryfalids, and nymphs, de- 
-monttrated, that the death of a great number 
raifes the water a little, but not at all when they 
are few. 
The fas we have obtained are now enough 
to decide on the objet of our enquiry ; efpecially 
if compared with thofe of Sig. Cigna and Ve- 
ratti (2). Two principal refults arife: Firft, 
that 
- 
(1) The author evidently means yarious fpecies of 
onoculi—T . 
(2) In the fourth volume of the Afa Bononia is a me- 
moir concerning the effect of confined air, (in which’a 
candle has burnt,) on animals, and fome other experiments 
on confined air. This memoir has probably been over- 
looked, though the Aa are frequently quoted. The au- 
thor does not afcribe the death of animals ‘ to the dimin- 
‘ ifhed elafticity of the air, but to fome change which it 
, undergoes from its natural fate, by frequent inf{piration 
£ ang 
