FEBRUARY 24, 1923] 
tion of the use he will make of his newly acquired 
freedom. 
The first four chapters are devoted to a presentation 
of the theories underlying psycho-analysis, based on 
purely Freudian doctrines, but abundantly illustrated 
by the author’s own observations and cases. After a 
description of sexual development, the unconscious and 
_ the censorship, the neuroses are considered in detail— 
the method of their production, their classification and 
individual psychology. A long description is given of 
_ a case of compulsion neurosis and its analysis, which is 
_ of considerable value in illustrating the preceding 
chapters on theory. 
The book is evidently intended for, and will appeal 
most to, the student who has some acquaintance with 
‘psycho-analysis, and is desirous of extending his know- 
_ ledge on the subject. 
Reinforced Concrete Simply Explained. By Dr. Faber. 
(Oxford Technical Publications.) Pp. 77. (London : 
H. Frowde and Hodder and Stoughton, 1922.) 
5s. net. 
A very clear and simple account of the elementary 
principles of reinforced concrete design is given in 
Dr. Faber’s book, and it will be found suitable for those 
who wish to have the knowledge required for the design 
of simple structures which will be safe, but not neces- 
_ sarily the last word in economy. The book covers the 
_ ground required for beams, slabs, and pillars. Both 
shearing and bending are considered in connexion 
with beams, and the effects of fixing the ends and of 
continuity are clearly explained. The design of pillars 
also includes a simple treatment of the bending 
moments communicated to the pillar by beams which 
are integral with it. There are very few blemishes, 
and these are of a minor character only, e.g. on p. 33, 
Fig. 7, the lower arrow for the dimension d is misplaced. 
On the whole the book is the soundest production of 
an elementary character which we have yet seen, and 
will be very useful to students of engineering who have 
to acquire a knowledge of reinforced concrete among 
other subjects in their course. 
Memoirs of the Geological Survey : England and Wales. 
The Geology of the London District. (Being the Area 
included in the Four Sheets of the Special Map of 
London.) By H. B. Woodward. — Second edition, 
___ revised, by C. E. N. Bromehead ; with Notes on the 
; Paleontology by C. P. Chatwin. Pp. vi+gg9. 
. (Southampton: Ordnance Survey Office ; London : 
E. Stanford, Ltd., 1922.) 1s. 6d. net. 
Tus new edition of the brief general geological guide 
to the London District, issued at a moderate price, 
will be of interest to thousands of citizens who spend 
their daylight leisure in rambles beyond London’s 
fringe. The nature of the ground below the city is 
well brought out ; but the four sheets of the one-inch 
map covered by the memoir also include pleasant fields 
where the outcrops of the strata may be traced. The 
description of the gravels shows how much may be 
learned from material excavated in the urban areas, 
when this is correlated with the terraced deposits of 
the Thames valley as a whole. The description and 
classification of stone implements is brought well up- 
to-date. GirAz,.J-.C.- 
NO. 2782, VOL. 111] 

2 
* 
NATURE 
251 

Lecture Demonstrations in Physical Chemistry. By Dr. 
S. van Klooster. Pp. vi+196. (Easton, Pa.: The 
Chemical Publishing Co.; London: Williams and 
Norgate, 1919.) 
Dr. van Kxiooster has brought together a number of 
experiments suitable for lecture demonstrations in 
physical chemistry. These experiments, to the number 
of 253, include, in addition to the more obvious experi- 
ments such as the determination of molecular weights, 
a series of thirty experiments on colloids and adsorption, 
some eighteen experiments on actino-chemistry, and 
conclude with a short series of experiments in which 
liquid air is used. When physical chemistry is taught 
to advanced students, lecture demonstrations are often 
regarded as superfluous ; but with the growing import- 
ance of the subject the demand for suitable illustrations 
is likely to increase. The volume before us will, 
therefore, be welcomed by many teachers who will find 
- it a considerable help in introducing experimental 
demonstrations into their lecture courses. 
Manual of British Botany: Containing the Flowering 
Plants and Ferns arranged according to the Natural 
Orders. By C. C. Babington. Tenth edition, with 
amended Nomenclature and an Appendix. Edited 
by A. J. Wilmott. Pp.lvi+612. (London: Gurney 
and Jackson, 1922.) 16s. net. 
In this edition Mr. Wilmott has endeavoured to bring 
the names up-to-date ; and on the vexed question of 
nomenclature has, so far as possible, cited the author 
who first gave to the name employed the connotation 
expressed in these pages. In the appendix have been 
inserted the more important revisions of genera (e.g. 
Moyle Rogers ‘‘ Conspectus of the Rubi ”), additional 
species, and, in places, important information connected 
with the main body of the work ; the inclusion of all 
varieties now accepted—many of which were deliberately 
rejected by Babington—having proved impossible. 
For its size and weight (74 oz.) the manual might be 
deemed expensive ; but it has a value possessed by no 
other for the serious student of the British flora. 
Le Mouvement scientifique contemporain en France. 
No: +. Les Sctences naturelles. By Dr. G. Matisse. 
(Collection Payot. No. 10.) Pp. 160. (Paris: 
Payot et Cie., 1921.) 4 francs. 
TuOsE desirous of keeping touch with the recent work 
of French biologists, but unable to consult the original 
memoirs, will find here useful epitomes of the results 
and views of some of the more prominent workers. The 
first chapter is devoted to Lacaze-Duthiers and the 
Roscoft laboratory. The subsequent chapters contain 
summaries (i.) of the work of Yves Delage and Bataillon 
on heredity, artificial fertilisation, etc. ; (ii.) of Houssay’s 
experiments in dynamic morphology, in which those 
dealing with the shapes of fish are of especial interest ; 
(iii.) of the results achieved by Cuénot, Bohn, and Réné 
Quinton in their several fields of research ; and on the 
botanical side (iv.) of Chauveaud’s work on plant develop- 
ment and transitory tissues ; Molliard’s investigations 
of the structural effects of artificial nutrients, and of 
parasitism ; and Matruchot’s cultivation of basidio- 
mycete fungi from the spore to maturity. 
