BOOK REVIEWS, 
173 
mention of South Africa. Yet one ought to expect great variety of 
vegetation, for South Africa stretches far and its mountain ranges 
ensure much variation in precipitation, so that many large areas are 
suitable homes for the moisture-loving ferns and their allies, the 
horse-tails, club-mosses, and Selaginellas. No fewer than 220 species 
are described and figured in this second edition of Mr. Sim's careful 
work, more than forty more than were known in 1892 when the first 
edition was published, and in addition there are many varieties. 
Outline and detail drawings of all the species are included in the plates 
which form an important feature of the book. Christensen's " Index 
Fili cum " has been followed in nomenclature, so that the work is quite 
up-to-date in every way. 
Of the 220 species 42 are endemic in South Africa, the remainder 
being distributed as to 151 in other parts of Africa, 16 in Europe, 76 
in Asia, 60 in Australasia and Polynesia, and 77 in America. Fourteen 
British species are included, and forms nearly related to Drycpteris 
Filix-mas (D. elongata), Ophioglossum vulgatum (0. capense), and 
Ceterach officinarum (C. cordatum) are also found. Some of these are, 
of course, of practically world-wide distribution, such as Dryopteris 
Thelypteris , Polystichum aculeatum, Asplenium Trichomanes, Adian- 
tum Capillus-Veneris, Pteris longifolia, Pteridium aquilinum, and 
Lycopodium • clavatum. 
It is evident that a considerable number of new ferns still await 
introduction to our gardens, though most of them will no doubt need 
the protection of glass in order to bring them to perfection. 
The work will prove the standard one upon the subject with which 
it deals, whether from the point of view of its completeness, the 
fulness and lucidity of its descriptions, or the clear figures which 
illustrate it. Where a species is now described for the first time, 
in addition to the English description a Latin one is given. 
" Garden Farming." By Lee Cleveland Corbett. 8vo. 473 pp. 
(Ginn & Co., Boston, New York, Chicago, London.) 8s. 6d. 
This book is well worthy of study by all those who possess an 
ardent desire that our waste, uncultivated land in England should 
be put to greater use towards increasing our national food supply. 
With the return of disabled soldiers from the Great War, it will become 
imperative for us to understand the value of the use of machinery 
as a labour-saving means of production, and this book, with its 
beautifully clear illustrations, should be of assistance in this respect. 
In the United States, the home garden, small as it often is, can be 
cultivated by horse-power, because crops are planted in long rows. A 
good picture is given of a disk harrow, which is used on the same day 
after ploughing, and loosens, lifts, and pulverizes the soil, marking thus 
one of the greatest advances that has been made in good cultivation. 
These harrows, and the Acme harrow in a lesser degree, do not compact 
the soil, but the McColm pulverizer and clod-crusher answers this 
purpose. These machines,|together with the mechanical transplanter 
