MR. JAMES B. LEWIS wrote that those interested in tin-lode mining were indebted to Mr. Herman for his very extensive treatment of the subject; indeed, that paper would be a classic, and would be studied as such by future generations of mining engineers. It represented a very large amount of industry and patient investigation, and its author had spared no pains in the collection of information for it. Doubtless the exigencies of his position had prevented him from classifying his results in a thoroughly satisfactory manner, and deducing principles of right practice from the very varied treatment adopted by different operators. To adopt phraseology suitable to their environment, his paper was a mine containing numerous shoots of ore of varying value, rather than a mineral product that they could turn to immediate use. There were a few errors which he (Mr. Lewis) noted, and which could doubtless be successfully blamed to the compositor. On page 279, fifth line from the bottom, it was stated that "minerals accompanying the tin are cassiterite, &c." On page 350, referring to the Anchor mine, in line 16 from the top, they were told that the stamps "were 2 cwt" They were supposed to be 10 cwt., but were really about 9. In the first illustration, a photograph of the Anchor battery by his (Mr. Lewis's) son, it was described as a general view of the mill, &c., looking from near the crusher station. The actual site of the camera was about_x000D_
mile from the crusher station, and on the track from Lottah.