[ ,286 ] 
■burning horn, hair, or oyfters ; whereas burnt fucus’s 
and confervas yield a frnell not much unlike that of 
common land vegetables. Even the ftony coralline?, 
when their cretaceous covering has been diffolved in 
vinegar, the membranous part, that remains of them, 
put into the fire, yields the fame animal i'mell with 
other corallines. 
Further, lince I find the Do£or has promifed the 
Royal Society to continue his refearches at the fea- 
fide, the following hints may be of ufe to him;. 
And, firft, he will find, that thofe he feems to 
think naked polypes, which he found adhering to 
corallines and other bodies, are really fmall corallines 
and efcharas, with their proper fkins and cells $ all 
which I have particularly defcribed already. I would 
then recommend him to examine fuch corallines as 
are taken out of the deepeft water, which are found 
adhering to fhells and fucus’s. He will find Mr. Cuff’s 
aquatic microfcope, or one of that form, the moil 
commodious for obferving thefe animals alive. 
The moft tranfparent ones he will find the beft to 
difcover their gelatinous infide, which runs thro’ the 
ftem and ramifications, and ends in the heads, where 
the claws are. Some of the beft kinds to obferve 
are as follows : The fea-oak coralline, the lily* 
flowering coralline, the great tooth coralline, the 
lea-thread coralline, and the branched tubular co- 
ralline. Pieces of thefe fliould be cut off while they 
are in the fea water, and placed in watch- glalfes full 
of the fame : in thefe they fliould remain a while, 
till they recover themfelves ; and when they are 
placed on the ftage of the microfcope, the motion 
of the internal part communicating with the heads 
will be eafily discovered. 
If 
