34 



ANIMALCULA OF INFUSIONS. I, 



I could have wifhed, when my experiments 

 were made on other animals, to have alfo made 

 them on their eggs ; but it was not always as 

 convenient for me to procure the latter. Thus 

 when, at one time, I had abundance of larvae 

 of mufkitoes, water fleas (i), rat-tail worms (2), 

 and other aquatic infefts, 1 never could fucceed 

 in finding the eggs whence they originated. 

 However, it did not appear that my labour would 

 be loft in maldng experiments on the animals. 

 The nymphs and larvse of mufkitoes (3) died at 

 111° ; rat-tail worms and water fleas, at 106° ; 

 water newts and leeches died at 1 11 ° ; the eels 

 of vinegar, at 113°. 



In my experiments on filk-worms, the caterpil- 

 lars of elm butterflies, and the worms of the 

 large flefh ^y, I was more fuccefsful, as I had 

 both the animals and their eggs. Until 93°, filk- 

 worms did not appear aifeaed ; at 95^, and par- 

 ticularly 



(1) No name 'is*inore mconealy applied in general 

 than nvaferflea; almoft every imall aquatic animal, even 

 fquillis and gyrini, have been fo defigned. It is noft likely 

 the author means the vionocuU of Linnxus. There is a 

 complete fyftematic hiftory of thefe, and many other mi- 

 nute aquatic animals, by MuUer, EntomoJJraca Jeu Ivfeaa 

 Tefiacea, 17S5, ^to. — T. 



(2) Reaumur fo denominates certain white worms from 

 the refemblance of their tail to a rat's. 



(3) It is uncertain whether the author may not mean 

 tipulas. — T, 



