REVIEWS 85 
PERIDOTITES AND CORUNDUM 
[AUTHOR’S ABSTRACT] 
Corundum and the Basic Magnesian Rocks oj Western North Caro- 
lina. By J. Votney Lewis. Bulletin, North Carolina Geologi- 
cal Survey, No. 11, 1896. 
Corundum and the Peridotites of Western North Carolina, By 
JosEpH HyprE Pratt and JosepH VoLNEyY Lewis. Reports, 
North Carolina Geological Survey, Vol. I, 1906. 
Corundum and its Occurrence and Distribution in the United States. 
By JosrepH Hyper Pratt. Bulletin, U. S. Geological Survey 
No. 269, 1906. 
Although a decade elapsed between the appearance of the first and the 
last two of the above publications they are so intimately connected that 
they should be reviewed together. 
The first is a record of the distribution and the modes of occurrence 
of the peridotites and the associated corundum deposits of western North 
Carolina, with briefer descriptions of similar occurrences throughout the 
eastern crystalline belt of the continent. 
The second is an elaboration and revision of the first, particularly as 
regards the petrography of the peridotites and the mineralogy of corundum 
and the associated minerals. It differs essentially from this, however, in 
that it takes up quite fully the theoretical questions of origin and relation- 
ships of the various rocks and minerals concerned. 
The third publication listed above, although bearing the name of but 
one of the authors, is essentially a rearrangement of the subject-matter 
of the other two, with the omission of most of the petrography and a slight 
enlargement upon important localities outside of North Carolina. It is, 
in the main, a reprint, both in text and illustrations, although this fact is 
nowhere indicated. A footnote on p. 28 merely refers to the North Caro- 
lina report, without naming the authors or intimating that the text is the 
same. Joint authorship for four pages of text is acknowledged, however, 
in a footnote on p. 62, and the reader is left to infer that the remainder is 
the work of the author whose name appears on the title-page. 
This review is therefore chiefly concerned with the second, Corundum 
and the Peridotites of Western North Carolina, which constitutes the first 
volume of a new series of reports of the North Carolina Geological Survey. 
It is a volume of 464 pages, is illustrated by 45 plates and 35 figures in the 
