728 SCIENCE PROGRESS 



portion of the course is, rightly, devoted to experiments with soils and manures. 

 The subject-matter here is excellent and well preserves the balance which it is 

 necessary always to maintain between science and its application. 



In most respects the arrangement leaves nothing to be desired. It is not 

 obvious, however, why after dealing with the mechanical analysis of the soil in 

 Section II., one should have to wait for Sections XII., XIII. and XIV. before ex- 

 perimenting with sand, clay and humus. 



The little book will be found extremely valuable both to students and 

 teachers of agricultural chemistry and it can be cordially recommended. 



S. J. M. AULD. 



