560 ' . PHILOSOPHICAL TRANSACTIONS. [aNNO 1700-1. 



itself from its troublesome guest, but in vain, the small one keeping his hold. 

 This devouring worm, when arrived at its full growth, is exadly represented in 

 fig. 11. 



In fig. 12, ABCDEF represents a tounekin, which hut the evening before had 

 been a worm, and which had cast a very thin skin; and as tiie body of the 

 worm consisted of so many rings or circles, so likewise did the tounekin. In 

 this I not only observed the feet, but even their joints, cg and dg represent 

 its two horns, and though they were inclosed in a thin membrane, yet I could 

 clearly see all their joints, and they were loose from the body, excepting only at 

 the head. This worm, both before and after its change into a tounekin, is 

 very white, and some days after the eyes appear full of many sights, and of a 

 brownish colour. I have often endeavoured to watch the change of these 

 worms, but it is so sudden, I could never do it. 



I formerly mentioned that the mites in cheese turned into toimekins, and 

 from thence into flies : I can now add, that when they are turned into tonne- 

 kins, they lie inclosed in a thin transparent membrane. Now this pellicle 

 that covers tiie tonnekin, is a great defence for the worm within it, which 

 being not able to shut itself up in a web, as many other insects do, before their 

 approaching change, that they may not be devoured by their enemies, without 

 such a pellicle would certainly become a prey to the maggots that swarm in 

 cheeses. 



I have observed that some of the said flies produced from these cheese worms, 

 which I kept in a glass, and put cheese into them to feed upon, after they had 

 eat of it, they coupled ; and soon after, all of them laid eggs of an oblong 

 form, and then died. From these eggs came young worms, which also fed on 

 the cheese, and when I judged them to be at their full growth, and the weather 

 began to be cold, I took six of the largest and carried them about me, and 

 after a few days I observed that 4 were changed into tonnekins, that 2 worms 

 were dead, and '2 flies were skipping about the glass. I tried the same thing in 

 January, and with the same success ; whilst I kept them in the cold, there was 

 httle or no sign of life or motion, but as soon as I put them into my pocket, 

 they were as brisk as in summer. I opened a tonnekin that had never produced 

 a fly, and found a dead one within it, which had been making its eftbrts to get 

 out, but was not strong enough to effect it. 



Dissection of a IVoman who died in Childbed. By Peter Sylvester, M. D. and 

 F.R.S. N° 269, p. 787. Extracted from the Latin. 



A woman, named Duchesne, about 40 years of age, after having gone the 

 usual time with child, was seized with a profuse flooding about four o'clock in 



