CHAP. 
I. 
II. 
IIT, 
CONTENTS 
INTRODUCTION 
By F. W. OLIvEr, ERS. 
PLANT FOOD AND SOIL PROBLEMS 
By W. B. Botromiey, M.A., Ph.D. 
WASTE LANDS 
By F. W. OLIvErR. 
TIMBER PRODUCTION IN BRITAIN 
By E. J. Sarispury, D.Sc., F.L.S. 
TROPICAL EXPLOITATION, WITH 
REFERENCE TO RUBBER . 
By J. C. Wirtis, M.A., Sc.D. 
THE COTTON PLANT, ITS DEPENDENT IN- 
SPECIAL 
DUSTRIES, AND NATURAL SCIENCE . 
By W. Lawrence Batts, Sc.D. 
VEGETABLE DYES . : 
By the late Saran M. Ragen aD); Se. 
TEA-MAKING : 
By S. E. CHANDLER, DSe,, ARCS. FLS. 
THE PLANT AS HEALER 
By Eruert N. Tuomas, D.Sc. 
PLANTS AS A SOURCE OF NATIONAL POWER— 
COAL. é 
By Marie C. SToPEs, DSc., Ph.D. 
PAGE 
Ld 
25 
43 
62 
99 
T20 
140 
155 
