I90 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY, 
BOOK REVIEWS. 
"The Principles of Plant-Teratology/' By W. C. Worsdell. 
Vol. II. 8vo. 53 plates, 296 -f xvi pp. (Ray Society, London, 1916.) 
25s. net. 
The features that characterized the first volume of this important 
work are characteristic also of this, the final one, dealing with the 
teratology and origin of the flower and fruit. The various stages 
by which the most highly developed flowers of the present day have 
reached their special form are discussed in the light thrown upon the 
subject by the malformations which so frequently occur and which, 
naturally, attract the attention of the curious. Two types of in- 
quirer will find much to interest them in the present section of the 
work — those whose interest lies mainly in noting aberrations in 
floral structure, such as doubling, proliferation, and the like, and 
those who look to such changes to aid in explaining the origin of 
the parts of the flower from primitive forms. The latter especially 
will find the discussions of the various views that have been expressed 
from time to time, with the bibliographies which form a feature of 
the book, of great value, and both will find interest in the clear plates 
some of them well coloured) for which all the publications of the 
Ray Society are remarkable. 
" Plants, Seeds, and Currents in the West Indies and Azores : 
The Results of Investigations carried out in those Regions between 
1906 and 1914." By H. B. Guppy, M.B., F.R.S.E. (with three 
maps, and frontispiece of West Indian Drift Seeds and Fruits brought 
to -the shores of Europe.) 8vo. 531 pp. (Williams and Norgate, 
London, 1917.) 25s. net. 
This great work consists of 440 pp. of text, 50 pp. of appendix, 
and a general index of 27 pp. Of the nineteen chapters, i. and ii. deal 
with West Indian Currents ; iii. and iv. Atlantic Currents ; v. The 
Mangroves in Jamaica ; vi. and vii., xi. and xii. The Drifts of the 
Turks Islands, near the Bahamas ; viii.-x. Miscellaneous Plants ; 
xiii. Currents of the Southern Hemisphere ; xiv. Differentiation in 
Plants ; xv. Their Distribution ; xvi. The Distribution of Carex and 
Sphagnum ; xvii.-xix. The Azores. 
The first four chapters dealing with currents require the first 
eighty-three pages and contain a large mass of data, as to the means 
of mapping the surface or drift currents. Two methods are fully 
described : the natural discharge by rivers of seeds and fruits into the 
oceans, and experiments with bottles thrown overboard at certain 
places and then recovered elsewhere. 
