VOL. XVII.] PHILOSOPHICAL TRANSACTIONS. 445 



Then we again fitted the bottle with the said perforated piece of leather and a 

 double bladder, and let it down 50 fathoms ; when it again came up entire. 

 Again immediately we let it down 75 fathoms, and then it came up broken and 

 full of water. 



Again, being in 3g^° of latitude, and by the ship's account 150 leagues west- 

 ward of Portugal, I caused a Florence flask to be well stopped with a bladder 

 over the mouth of it, and lowered down 30 fathoms, but it was taken up 

 broken. Whereupon imagining that the roughness of the leads hailing so 

 tender a body so violently through the water might be the cause of breaking it, 

 I caused another flask in the like manner to be fitted, and close by it I tied like- 

 wise another flask, so as to be borne with the mouth downwards, as were the 

 others, but which was not stopped ; and these I caused to be taken up when 

 they had been but 10 fathoms under water, and found them both entire, but 

 the open flask almost full of water. These being emptied, were both let down 

 again, and taken up at 20 fathoms, when the open flask was entire, though full 

 of water, but the other broken to pieces. 



Lumbricus Hydropicus ;* or, an Essay to prove that Hydatides often met with in 

 morbid Animal Bodies, are a Species of IVorms, or imperfect Animals. By 

 Edward Tyson, M.D. and R. Soc. S. N° igS, p. 506. 



By the opportunity given me of dissecting a gazella, or antelope, brought 

 from Aleppo, I observed several hydatides, or films filled with limpid water, 

 about the size of a pigeon's egg, and of an oval form, which were fastened to 

 the omentum, and some in the pelvis, between the bladder of urine and the 

 rectum. On this occasion I was very desirous of satisfying myself as much as 

 I could of some suspicions I had of the like watery bags, or hydatides, I had 

 met with in other animals ; for from what I could then observe, I was apt to 

 believe them to be a particular sort of insect bred in animal bodies, but so dif- 

 ferent from any observed out of them, that unless upon fuller and further con- 

 siderations I durst not trust my own thoughts about them. 



My present reasons for suspecting them to be insects, or at least the embryos 

 or eggs of them, are these. First, because I observed them included in an 

 outward membrane, like a matrix, so loosely, that by opening it with my fingers 

 or a knife, the inward bladder, containing the lympha or serum, seemed no 



* This animal is a species of taenia or tape-worm, and is one of those which have the body termi- 

 nating in a large dilated cavity or bladder. It is the taenia globosa var. ^. of the Gmelinian edition 

 of the Systeraa Naturae of Linnaeus, and the hydra hydatnla of the 12th edition of that work by 

 Linnaeus himself The most accurate description, accompanied by figures, may be found in the 

 work of Gocze. 



