268 Treatise on 
white or of a pale Yellow, tranfparent, finning, 
dry, and free from Filth. It likewife comes to us 
in larger Lumps, of a reddifli Colour, and full of 
Impurities, which are referved only for mechanical 
Ufes. 
The Tree which produces it is called Acacia folio 
Scorpioides leguminof# , C. B. P. 392. Acacia vcra , 
J. B. 1. 429. Acatia Sant Akakia , P. Alpin, de Plant . 
y . Egypt 1 5. Acacia JEgyptia , Fab. Column# in Recch. 
Obferv. 866. Acacia Adgyptiaca foliis Scorpioides le- 
guminofe , Siliquis albis compreffis , ifthmo intercepts y 
floribus luteis , H. Ludg . Bat. In Egypt about Cairo ^ 
according to Auguftin Lippi , it grows in great Plenty. 
The Juice expreffed from the green Pods of this 
Tree is the Acacia of the Shops ; but we fhall treat 
of this in its proper Place. The Gum iffues from 
Fifiures in the Bark of the Trunk and Branches, in 
the Form of a vifcid Juice, and in Time grows hard, 
not unlike the Gum which flows from Plumb-Trees, 
Cherry-Trees,&V. which have likewife much the fame 
Qualities ; but this is preferred, becaufe its Virtues, 
having been confirmed by longer Experience, are 
better known. It appears in Grumes of different 
Sizes and Figures, as it happens to concrete upon 
the Tree, being either long, or round, or fome- 
times contorted like Worms : This laft is called 
Gummi Vermiculaium , and was highly valued by the 
Ancients, but it differs from the reft only in 
Figure. 
In a chymical Analyfis , two Pounds of the pureft 
Gum Arabick yielded three Ounces and five Drachms 
of clear Phlegm, without either Smell or Tafte ; 
ten Ounces, three Drachms, and fifty four Grains 
of acid and reddifh Phlegm ; one Ounce, fix 
Drachms, and thirty fix Grains of alkaline Liquor ; 
and one Ounce, five Drachms, and twenty four 
Grains, both of thinner and thicker Oil. The black 
Mafs 
