VW Lea IV. Salts of Plants, 265 
Thorn, Common Wormwood, Afh, and Tartar. All which diffol- 
ved feverally in fair water, I expofed in a Chamber window, and 
not in Winter, as before, but in the heat of Summer, fè. on the 19 of 
July, to evaporate of themfelves. 
4. $. The Effe& was, That the third day after their being ex- 
pofed, the Efential cryftals began'to fhoot in three of the Solutions, 
fé. in that of Rofemary, of Garden Senroygrafs, and of Black Thorn. 
t On the fouth day, in that of Wormwood. Ont h day, in that of 
| Afh. In that of Tartar, not at all. 
| 5. $. Thefe Efential Cryft 
then to fall to the bottome 5 
began, in all, to fhoot at the top, and 
as in the Experiment before. But as there 
dd was very little of the white Sedement before mentioned, that preceded 5 
i, Somo Scum or Cremor at all. Which although a more perfedt Calcina- 
Me tion, it fecms, did here almoft prevent; yet did not in the leaft deftroy 
i y 
th 
orcfaid Efential Salt, but rather make way for its more fpeedy and 
copious Production: exhibiting likewile a diftin& Species in feveral of 
ie the Solutions. 
e Ol 6. $. For firft, the Cryftals of Rofemary (the largeft of them ) 
fe were about the bigneß of a Rice-Corm, In Figure almott likea Tip-Cat, 
cl which Boys play with, fplit down the midle. Each Tip being cut into Tah. 83 
5 fides all ending in a poynt: the midle part divided into 7, all drawn =" 
tk by parallel Lines 3 the topmoft with the lowermoft but one, on each 
fide, beeing three exact Squares. 
7. $. The Cryftals of Black Thorn are molt of them poynted with 
juft fix fides of Equal Meafire: very like to the footing of true 
Cryftalic felf. From the topmott of which fix Sides, a Lize being drawn Tab. 83. 
out, runs parallel toa broad Bafe, whereon cach Cryflal (tands. So 
that they are in fome fort of a Rhomboid Figure. 
8. $. The Cryftals of Senroygrafs have alfo a very elegant and regu- 
lar Figure, which is in a manner compounded of the two former now 
deferibed. But they are nothing near fo bigg, the largeft of them, 
being no biger than a Grain of that which we call Pear! Barley. 
9. $. The Cryftals of Wormwood have alfo very many of them a 
regular Figure 5 but quite different from that of the Crystals before 
mentioned 5 each Cry/tal being a little Cylinder, faving that it is con- 
ftantly fomewhat fmaller at one end,than the other:as it were one half 74 8 
of a Rowling-pin. And not evenly Circular, but cut out by Six Sides "2° 
of equal Meafire: almoft asin the Cryftál of Nitre. So that contrary to 
what is feen in the forementioned Cry/tals, the ends of thefe of 
Wormwood are not poynted, but flat; and cut at Right Angles with 
the Sides. 
10. $. The Cryftals of Afh, though by their properties they appear 
likewife to be Effential 5 yet are nothing near fo regularly figurd, as 
all the forementioned, 
11. $. The Colour alo of the faid Cryftals is fomewhat different : 
Thofe of Afb being of a brown tranfparency, almoft like thofe of Firme. 
Thofe of Wormwood being alfo brownifh, but paler. Thole of Rofe- 
mary and Scurvygrafs having fome little Tinéure, yet very clear. But 
thofe of Black Thor» without the leaft Tiviure, and as clear as CryStat 
it (elf 
Rr §. 12, 
