Time 69 100. Place and height 70 Expression of Results 101. Temperature records 70 102. Temperature sums and means 70 103. Temperature curves 71 104. Plant temperatures 71 Precipitation 105. General relations 72 106. The rain gauge 73 107. Precipitation records 74 Wind 108. Value of readings 74 109. The anemometer 75 110. Records 76 Soil 111. Soil as a factor 76 112. The value of soil surveys 77 113. The origin of soils 77 114. The structure of soils 78 115. Mechanical analysis 79 116. Kinds of soils 79 117. The chemical nature of soils 80 Physiography 118. Factors 80 Altitude 119. Analysis into factors 81 120. The barometer 82 Slope 121. Concept 83 122. The clinometer 83 123. The trechometer 84 Exposure 124. Exposure 85 125. Surface 85 126. Record of physiographic factors 86 127. Topography 86 Biotic Factors 128. Influence and importance 86 129. Animals 87 130. Plants 87 METHODS OF HABITAT INVESTIGATION