[ 146 ] 
note animals that were fwimming over them, and all 
round them, in the leaft-affefted by the fait *. 
I further obferved, that the cryftals that appeared 
firft increafed in fize, and began to vary their forms ; 
for inftance, many of the cryftals, at the latter end 
of April, among the reft, were of the form of thofe 
in the line of fig. 8. About the 5th of May, many 
of them appeared as at fig. 9 ; and at the latter end 
of May, about the 20th, many of them were of the 
form of thofe at fig. 1 o : moft of the variety of forms 
appearing at the fame time. 
It was objedled by fome very ingenious men, to 
whom I had imparted this difcovery, that thefe falts 
might be owing to fomething in the water that I had 
made ufe of, which, joined to the oil in the hemp- 
feed, might produce this appearance. To obviate 
this; 
Experiment II. 
I prevailed on my friend, Mr. P. Woulfe, F. R. S. 
to furnilh me with fome water that had been moft: 
carefully diftilled, by a very Dow procefs ; and at the 
fame time I procured hempfeed from a different part 
of the town. On the 30th of April, I put an ounce 
of this hempfeed to about four ounces of this diftilled 
water, into a glafs cylindrical veffel, and covered it 
carefully with a glafs cover ; and on the 1 2th of May 
I examined the fcum, and found it more tranfparent, 
* Mr. Needham obferves, in his curious Memoir before 
mentioned, p. 649, that fait deftroys thefe animalcula ; this, I 
believe, is very true of the common kinds of’ fait; and which 
renders the nature of this kind of fait flill more fingular. 
but 
