October, 1910,] 



859 



Reviews. 



fruits ; the one on page 116 is so crowded 

 that only very partial recognition is 

 possible. 



Planting and tropical agriculture 

 generally are, as the author points out, 

 only an extended form of gardening, 

 and similar forms of mechanical oper- 

 ations are applicable to both. The 

 remainder of the book therefore deals 

 briefly with tropical products in general, 

 and gives some account of the insects 

 and fungus pests of tropical products, 

 concluding with more general topics such 

 as transport of seeds, and calendars for 

 gardening work, which might perhaps 

 have been more logically appended to 

 the first section. 



We may perhaps venture to call the 

 author's attention to one or two minor 

 points, 



It might have been made clear upon 

 page 8 that the analyst's classifications 

 of soils into clays, sand, etc., depends 

 rather upon the size of the particles than 

 upon their chemical composition. 



We should like to see the paragraph 

 on soil fertility (p. 12) expanded in a 

 future edition. 



On page 45 we do not think that 

 enough strees is laid upon the selection 

 of individual plants for propagation. 

 The choice of the particular plant is far 

 more important than the choice of parti- 

 cular branches and seeds from the plant. 



On the whole Mr. Macmillan may be 

 congratulated on the production of a 

 valuable handbook and work of reference 

 and it is a pleasure finally to turn once 

 more to the illustrations which go far to 



m ake this the most attractive book on 

 gardening which has come into our 

 hands. 



Introduction to Cotton Cultivation in 

 German Colonies, by Prof. Dr. A, Zimmer- 

 mann, Botanist at the Imperial Biological 

 and Agricultural Institute, Amani (Ger- 

 man East Africa). 



2nd. revised edition, with 26 illustr- 

 ations. Berlin 1910, Kolonial-Wirtschaft- 

 liches Komitee, Unter den Linden 43. 

 Price 2 marks. 



The stimulus which cotton cultivation 

 in the German colonies has received in 

 recent years, and the need for a practical 

 up-to-date handbook, has caused the 

 Kolonial-Wirtschaftliches Komibee to 

 obtain a second edition of the hand- 

 book published in 1905 by Prof. Zimmer- 

 mann. The author has worked this up 

 with great industry and taken note, 

 not only of results in Genman colonies, 

 but also of those in cotton lands. The 

 book should, therefore, prove of interest 

 to the people of these other countries. 



In the first two chapters the author 

 deals with the botanical side of the sub- 

 ject, and describes the most important 

 varieties. He then goes on to selection 

 of seed, choice of land, preparation of 

 the ground, manuring, watering, seed 

 and sowing, care of the plants, the 

 harvest and its collection, <fcc. In the 

 final chapter the chief diseases are 

 described with good figures. 



Together with this book appears a 

 small appendix dealing especially with 

 East Africa. 



