VI.] INTERPRETATION OF ANALYSIS 19 1 



cultivation and its response to particular fertilisers is 

 known, then deductions can be drawn from the departures 

 from type of the particular soil. Thus the chemical, as 

 indeed the mechanical analysis of soil, must begin by 

 studying and establishing the soil types, by a soil 

 survey in fact, in which the collected analyses are 

 correlated with the observed behaviour of the soils in 

 the field and under experiment, before much informa- 

 tion can be extracted from the analysis of a particular 

 soil. Soil analysis is in fact a method for the expert 

 engaged in studying soils in general rather than a 

 means at present for answering questions about his 

 soil which may be asked by the individual farmer. 



