This section is from the book "The Engineer's And Mechanic's Encyclopaedia", by Luke Hebert. Also available from Amazon: Engineer's And Mechanic's Encyclopaedia.
A gummy, resinous, concrete juice, which issues by incision, and sometimes spontaneously, from the trunk and large branches of a tree, growing in Arabia, and Egypt, especially in Abyssinia. It consists of one-third resin, and two-thirds gum.
 
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