:Jin:cih/ircLSi of a Letter from Mr. Leewenhoeck, to 
theR. S, dated Jan. 23^/, 168I; Concerning the 
the Various figures of the Salts contained in fever al 
fubfiances. 
I Took fome of the Salt of Car duns B enediBus^ fuch as 
is commonly to be fold in the Apothecary's fhops : 
it was fomething moift, and the parts feem'd to be 
fo hudled up together, that they could not bediftin- 
guilhed froflii one another: I clofed it up in a Glafi, 
that the moiftnels thereof might not be evaporated i and 
when it had. flood ftopt for fome days, I perceived that: 
many of the particles were gone together, upon the fide 
oftheGlafs, making fome flat longifli figures, of diffe- 
rent magnitudes i the biggeft whereof, were about the 
lengthof the Diameter of a hair of my Beard, as Numb. 
I. Fig. E In another place, thefe Salts lay fo, that I could 
eafily difcern their thicknefs , ("which could not be done 
in the aforementioned ) as Fig. G. In another place, the 
aforefaid thin flat Salts, lay upon one another ; as Fig.H. 
I put this Salt in water to diffolve it, and took about as 
much thereof, as two Barly Corns ; fpreading it thin 
before me: and when it was in motion, I not only ob- 
ferved the above mentioned figures, and fliootings of 
the Salt; but found feverall new figures, which were 
thin and long, growing fliarp towards both ends: asi^^. 
L Others that lay near them were broader, but notfo 
long, and their ends not fo fliarp: as Fig. IQ Ifawalfo, 
fome perfect four fquare figures/ as Numb. L. but they 
had no thicknefs, that I could difcover. Alfo there 
were fome Quadrilateral Pyramidal figures, like thole of 
common Salt3as i^^.M.Thefe Oblervations multbe made 
before the watser is evaporated, for when the water is 
O o 2 almoft 
