Renews — Dana's System of Mineralogy. 367 



MulUon Cove. — To the south-west of the Cove near to Ladan 

 Ceyn, in the serpentine there is a dyke^ or vein of nearly pure 

 felspar containing some white mica, biotite, etc., with a nearly north 

 and south strike. 



Henscath to Polurrian Cove. — The Headland of Henscath is by no 

 means the most northerly termination of the serpentine, as I found 

 it continued in the cliff a little below the level of its top quite con- 

 tinuously among the hornblende-schists as far north as Carrag-luz, 

 and also on each side of the upper portion of the Cove there. There 

 is also an impure or transitional variety on the south-west side of 

 Eocky Pedn-y-ke which now brings the serpentine within a few 

 hundred yards of Polurrian Cove where the junction occurs between 

 the hornblende and the killas. 



I^IE'VIE^WS. 



-The System of Mineralogy of James Dwight Dana, 1837- 

 1868. Descriptive Mineralogy (Sixth Edition). By Edward 

 Salisbury Dana, Professor of Physics and Curator of the Mineral 

 Collection, Yale University. Entirely Ee-written and much 

 Enlarged. Illustrated with over 1400 figures. (London : Kegan 

 Paul, Trench, Triibner & Co., Limited, 1892. Eoyal 8vo. 

 pp. Ixiv. and 1134.) 

 N the Geological Magazine, for October, 1868 (Vol. V. pp. 

 460-463), we had the pleasure to notice the fifth edition of this 

 most valuable work, which has been before the scientific world 

 since 1837, and is likely to continue, for many years to come, the 

 standard treatise on Mineralogy. 



In the fifth edition the veteran mineralogist. Prof. J, D. Dana, 

 was assisted in his difficult task by Prof. Geo. J. Brush, and the 

 work was then re-written and enlarged to 827 pages. 



The present (sixth) edition, issued after an interval of nearly 

 twenty-four years, has been entirely re-written and much enlarged 

 by Professor E. S. Dana, son of Professor J. D. Dana, and already 

 favourably known to mineralogists as the author of a " Text-book 

 of Mineralogy," published in 1877 (Triibner & Co.), and noticed in 

 the Geological Magazine (Decade 11. Vol. IV. 1877, pp. 328-29). 

 During the past quarter of a century the science of Mineralogy 

 has made very rapid progress, indeed there has probably never 

 been a time of more active mineral ogical investigation. A striking 

 indication of this activity is shown by the many new periodicals, 

 recently started, devoted largely, if not exclusively, to Mineralogy. 

 The activity of mineralogical' workers is still further evidenced by 

 the fact that within the past twenty- four years nearly one thousand 

 new names have been introduced into the science — unfortunately, not 

 all " new species," although this has been claimed for most of them. 

 Nor has the important subject of the optical properties of minerals 

 been neglected, new and improved methods and instruments for 



^ As the locality of this dyke or vein is rather difficult to find, the Serpentine 

 ■worker in the Cove can guide anyone to it. 



