Various, Encyclopaedia Britannica, 11th Edition…
“ Canada balsam or Canada turpentine is the oleo-resin yielded by Abies balsamea, a tree that grows in Canada and the northern parts of the United States. It is a very transparent substance, somewhat fluid when first run, but thickening considerably with age, possessed of a delicate yellow colour and a mild terebinthous odour. It contains 24% of essential oil, 60% of resin soluble in alcohol, and 16% of resin soluble only in ether. Its chief uses are for mounting preparations for the microscope and as a cement for glass in optical work. ”
