The Engineer's and Mechanics Encyclopædia,
comprehending practical illustrations of the machinery and processes employed in every description of manufacture of the British Empire.
With nearly Two Thousand Engravings.
By Luke Hebert, civil engineer, edifor of the History and Progress of the Steam Engines, Register of Arts and Journal of Patent Inventions, etc.
In two volumes.
VOL. II.
London: Thomas Kelly, 17, Paternoster Row.
MDCCCXXXVI (1836).
Excrescences formed on the leaves of the oak by the puncture of an instct, which deposits an egg upon them. The best galls of commerce are those imported from Aleppo; they are chiefly used by dyers, calico printers, and ink makers, and are peculiarly valuable on account of their richness in tannin and the gallic acid.
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