BOOK REVIEWS. 99 
continually going on around them, silently but surely. We can commend it 
for the intelligent child, and for the older children in knowledge too. It is an 
untechnical Botany book. 
" London Trees." By A. D. Webster. 8vo. xii -f- 218 pp. (Swarthmore 
Press, London. 1920.) 15s. net. 
This is rather a high-priced book, but it contains a considerable body of 
information, gathered during the author's long experience in London parks. 
The illustrations, of which there are thirty-two, are generally good. 
The love of gardens, which has so long imbued the dwellers near London, 
has contributed to the establishment of large numbers of interesting trees in 
the city and its environments. Many old trees still flourish, in spite of the 
drainage that has been carried out, and of the smoke and dust and sooty fog, 
and many have reached fine proportions. Fortunately the spirit, which has 
gradually extended, tends now to the preservation of fine and interesting trees, 
so that the builder does not always ruin them. 
Lists, descriptions, notes, and historical incidents all form parts of this book, 
which contains a unique record which Londoners will value. 
" Market Nursery Work." I. " Glasshouses and the Propagation of Plants." 
II. " Special Greenhouse Crops." By F. J. Fletcher, F.R.H.S. 76 + 72 pp 
8vo. (Benn Bros., London. 1921.) 4s. 6d. each. 
These two little books are intended as guides to market nursery work and 
are clearly written, and give fairly full practical directions for carrying out 
the work involved. The first deals with generalities concerning glasshouses, 
but might perhaps have given fuller information on suitable arrangements of 
pipes and the like. It gives instructions for the raising of seedlings, making 
of cuttings, potting and watering of newly potted plants. The second takes 
the story further with particular reference to Tomatos, Cucumbers, Melons, 
Grapes, Sweet Peas, Forcing Bulbs, " lifted " Chrysanthemums, and various 
catch crops. The treatment recommended in each case appears to be the 
outcome of practical experience, and the books should be very helpful to those 
who are concerned with the industry, so long as they realize that their practice 
may need modification according to the special circumstances which surround 
them. 
" The Manufacture of Sugar from the Cane and Beet." By T. H. P. Heriot. 
8vo. illus. (Sir Edward Thorpe's Monographs on Industrial Chemistry. 
London, 1920.) 
This valuable treatise by Mr. Heriot, the lecturer on sugar technology at the 
Royal Technical College, Glasgow, is written on the principle that a theoretical 
knowledge of their subject is becoming more and more indispensable to all 
those engaged in the various branches of chemical industry. 
