Foreign Vegetables, 
213 
CHA'P. VII. 
Of Liquid and Concreted Juices of Plants, 
B Y the Word Juice , we here underftand, not 
all the Juices of Plants in general and with- 
out Diftin&ion, but fuch only as are ufed in Phy- 
lick, diftilling from their refpedtive Plants either 
of their own accord, or more frequently by In- 
cifions ; and which are fometimes termed La - 
chrym<e , from their appearing in the Form of Tears 
or Drops as they fall down. Thefe Juices, for the 
mod Part, concrete, either into a Refin, or a Gum, 
or into a Subdance of a middle Nature between 
both, which is called a Gum-Refin. In the Shops 
they are often confounded, the Name of Gum be- 
ing there given to fome Refins, and likewife to 
many Gum-Refins-, but in order to didinguifh 
them with greater Accuracy, we fhall proceed to 
explain what is properly a Refin, a Gum, and a 
Gum-Refin. 
A Refin is a fat, oily, inflammable Juice, folu- 
ble in Oil, but not in Water. It confids of ful- 
phureous Parts united with an acid Salt. In Re- 
fpeft to its Confidence it is two-fold •, the one 
liquid, which is vifcid and tenacious 5 the other dry 
or folid, which is commonly friable, yet becomes 
foft by Heat. Among the liquid Refins are reckon- 
ed the Balm of Gilead , the Balfam of Peru , of Tolu , 
Capivi, Liquid Amber, Liquid Storax, the dif- 
ferent Sorts of Turpentine, and Labdanum. In 
the Clafs of folid Refins are Storax, Benzoine, 
Tacamahac, Olibanum, Madich, Sandarach, Dra- 
gon’s Blood, Copal, Anime, Caranna, Elemi, He** 
dera, and Camphore. 
p 3 
A Gum 
