266 OF HYDATIDS. 



it, or loosened from the ovarium, in which they were 

 formed, suck up their nourishment from the liquor 

 of the hydatid, which contaius them. By what ves- 

 sels the liquor, which has been absorbed, passes in- 

 to the cavity of the hydatid, or forms young hyda- 

 tids, we do not know ; probably such vessels exist 

 as in the echinus. If hydatids contract, on the ap- 

 plication of a stimulus, it must be granted, that these 

 are under the influence of nerves, though these 

 nerves be so small as not to be obvious to our imper- 

 fect senses. 



'^ Of the different states, in which hydatids are 

 found, 



^^ Hydatids are found in different states. The 

 rudiment of the hydatid is connected to the coats of 

 the pregnant hydatids, and appears with other small 

 hydatids, iu the form of small excrescences, which 

 are attached to the large pregnant hydatids, xlfter 

 n, time, these small hydatids are detached from the 

 parent hydatid. 



^^ Hydatids are subject to diseases. 



" Hydatids sometimes burst within their sacs. 



^< We sometimes meet with tumours, which are 

 made up entirely of pieces of coagulable lymph and 

 hydatids, the water having been removed by absorp- 

 tion ; hence the tumour does not communicate a 

 sense of fluctuation, as when the hydatids were en- 

 tire. 



*^ The external coat of hydatids has sometimes 

 been converted into bone- 



