35$, Mr. Hatchett's Experiments on Zoophytes, 



The Antipathes being then boiled with lixivium of caustic 

 potash, was completely dissolved, and formed the animal soap 

 of Mr. Chaptal. 



Antipathes myriophylla. 



This was subjected to experiments like those above related, 

 and, as the effects were the same, it is not necessary that parti- 

 cular mention should here be made of them. 



As the specimens of these Antipathes were small. I was not 

 able to make any additional experiments ; but what has been 

 said sufficiently proves how much they resemble the horny 

 stems of the Gorgonice. 



Sponges. 



Many species of Sponge were examined, but, as little or no 

 essential difference was found in the results, I shall include all 

 of them in what is now to be related. 



The following species, with many others not described, were 

 subjected to experiment. 



Spongia cancellata. 

 Spongia oculata. 

 Spongia infundibuliformis. 

 Spongia palmata. 

 Spongia officinalis. 

 When the Sponges had been immersed in nitric acid (diluted 

 with three measures of distilled water) during 14 or 16 days, the 

 acid became pale yellow, and was changed to an orange colour 

 by the addition of pure ammoniac. 



The Sponges which had been thus steeped in the dilute acid, 



