282 Reviews—Crystalline Structure and Chemical Constitution. 
I am inclined to believe that the features which puzzled me at the 
time of my visit may have been due to landslides or rock streams. 
This does not mean that the depression in which the features occur is 
not a glacial cirque, nor that the moraines reported by Atwood are 
not true moraines. It simply means that I am not wholly satisfied 
with the evidence of glaciation as reported by myself. It would seem 
that the possibility of a landslide of rock-stream origin for features 
apparently due to glaciation must be carefully considered, especially 
when glaciation in doubtful localities is involved. 
RAV LEws- 
pve) 
I.—Crysrattinr Srrucrure and Cnemican Constirution. — By 
A. E..H. Turron, D.Se., M.A. (Oxon.), F.R.S., A.R-C.Se. (onda): 
pp- vili204, with 54 figures in the text. London: Macmillan 
and Co., 1910. Price 5s. net. 
R. TUTTON’S reputation for crystallographical research stands so 
high that the announcement of a book from his pen on a subject 
of such primary importance as crystalline structure and chemical 
constitution cannot fail to awaken general interest among those 
interested in crystallography, but we fear that on realizing the true 
scope of the book many readers will feel considerable disappointment. 
Far from discussing the wide subject comprehended by the title of 
the book, Dr. Tutton confines himself entirely to a comparatively small 
section of it, and, moreover, to his own contributions to that section. 
Everyone may not have seen the prospectus relative to the series of 
science monographs of which this is the first volume, and may not be 
aware of the intention of the publishers that ‘‘ each volume will be 
unique, inasmuch as the author will describe chiefly his own con- 
tributions to the specific subject of scientific research with which 
it deals”: to prevent misunderstanding it is desirable that this 
restriction should appear on the title-page. This volume, at least, 
cannot pretend to be at all an adequate discussion of the subject with 
which it is supposed to deal. 
On the other hand, the book provides an admirable summary of the 
fine series of investigations upon which Dr. Tutton has for the past 
twenty years been engaged, and the reader may obtain a clear idea of 
the nature and results of the research without the labour of hunting 
up the original papers in the various periodicals in which they 
appeared. The most casual reader cannot fail to be struck with the 
pains taken to ensure that the apparatus and the crystals used in the 
investigations were of the most perfect quality obtainable, and with 
the indefatigability that has characterized the observational work. 
In the introductory pages the author, doubtless carried away by his 
enthusiasm, has depicted in unduly dark colours the state of the 
knowledge of isomorphism obtaining at the time he commenced his 
researches. The book is well printed, and its value is enhanced by 
several excellent illustrations, in one of which the author is seen in 
the act of grinding a crystal-section. 
