CONTENTS 
116, Kinds of soils 
117. The chemical nature of sails 
Physiography 
118. Factors 
Altitude 
119. Analysis into factors 
120. The barometer 
Slope 
121. Concept 
122. The clinometer 
123. The trechometer 
Exposure 
124. Exposure 
125. Surface 
ae. Record of chitoxtaphie factors 
127. Topography 
Biotic Factors 
128. Influence and importance 
129. Animals 
130. Plants 
METHODS OF HABITAT INVESTIGATION 
131. 
Method of Simple astral 
132. Choice of stations 
133. Time of readings 
134. Details of the method . 
135. Records 
Method of Ecograph: Batteries 
136. ' ; 2 
Expression of Physical Fattor Resiilis 
137. The form of results 
Factor Records 
138. : 
Factor Curves 
139. Plotting : 
140. Kinds of curves . 
141. Combinations of curves 
142. The amplitude of curves 
Factor Means and Sums 
143. 
