In reply to an inquiry at p. 29 some time since, the Gardener's Monthly stated that Rhus copaliina was not the variety used for tanning purposes; but I find in Appleton's Cyclopaedia, edition of 1S79, that in Virginia the smooth, Mountain (copaliina) and Staghom are collected indiscriminately, and that American Sumac yields 15 to 20 per cent, or more of tannin, while the European yields 30 to 35 per cent, when not adulterated with other leaves. There are some other facts of interest relating to the manner of collecting and preparing, in that article, but I will leave it for the editor to judge whether they would be acceptable to the readers of the Gardener's Monthly. [Is not the Rhus glabra the "smooth sumac?" - Ed. G. M.]