CONTENTS. 
Page. 
Introduction 5 
The effects of heat on the solubility of inorganic constituents 7 
Preliminary work 9 
Method of preparing extracts 11 
Soil types 12 
Silica 13 
Alumina 14 
Iron 15 
Manganese 16 
Lime and magnesia 18 
Potash 20 
Phosphoric acid 21 
Sulphates 22 
Bicarbonates 23 
Effect of heat upon rice and taro soils 24 
Discussion 25 
The effects of heat on soil nitrogen 28 
Introduction 28 
Effects of heat on nitrates 31 
Effects of heat on the ammonia content 32 
Effects of brush burning in the field 33 
Effects of heat on the organic nitrogen 34 
Summary 37 
(4) 
