330 Mr. Hatchett's Experiments on Zoophytes, 



but a small appearance of gelatinous or membranaceous particles. 

 Pure ammoniac was then added, but did not cause any altera- 

 tion ; and the whole of what had been dissolved, was afterwards 

 completely precipitated by carbonate of ammoniac, and proved 

 to be carbonate of lime. 



Madrepora muricata. 



When treated like the former, it afforded some loose particles 

 of a gelatinous substance : these were separated by a filter, and 

 the solution was supersaturated with pure ammoniac, without 

 effect ; but, upon adding carbonate of ammoniac, the dissolved 

 part was precipitated, in the state of carbonate of lime. 



Madrepora labyrinthica. 



This, being examined in the manner abovementioned, proved 

 to be composed of carbonate of lime, and of a loose gelatinous 

 substance, similar to that afforded by Madrepora muricata. 



Madrepora ramea. 



When this Madrepore was first immersed in very dilute nitric 

 acid, a considerable effervescence was produced ; and, after a 

 few hours, a pale brown fibrous membrane remained, which in 

 some measure exhibited the original figure of the Madrepore. 

 The clear solution being poured into another vessel, only 

 afforded a large quantity of carbonate of lime. 



Ma drepora fascicularis. 



When this was put into very dilute nitric acid, a considerable 

 effervescence arose ; and, after some hours, a tender membrane 



