Excerpt from Soil Conditions and Plant Growth

When the revision of the present edition was begun it became obvious that some fundamental change would be necessary in the treatment. Since the first edition was published in June, 1912, the subject has grown enormously: it has now completely run away from the 166 pages that proved a sufficient allowance in those days. Several courses were open; the one chosen was to retain the general characteristics of the older editions, dealing broadly with the whole subject, emphasising the outlines and endeavouring to maintain a dispassionate balance between the various parts. Detailed treatment has been avoided, partly because it is now hopeless for any one individual to attempt it, and partly because I did not wish to overload the book and make it into a huge "Handbuch" where the outlines are all obscured and the perspective lost.

At the same time, however, the student must have access to the more detailed treatment, and it would have helped him little had I simply published a card index and left him to find out the rest for himself.

The problem was solved by enlisting the sympathy of the Heads of the Departments at Rothamsted, who each undertook to write a monograph dealing with his or her special branch, and which Messrs. Longmans will publish uniformly with this volume.

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