General Index, 



231 



Photographic development in light 



lii, Ivii, 161, 166 

 Photography lii, lv,lvi, Ix, 151, 209 



pi. 12-17 

 Planets, temperature 41 

 Plates, light-struck 151 



zero Ivii, 164 



Points, brilliant Ixiii. pi. A 

 Positive photography lii, Ivi, Ix, 162, 



209 

 President Ixvl 

 Pressure collectors 219 

 Propagation of trees Ivi 



Railway trains vs. air 215 



Reptiles and bacteria ixi 

 Rhizomes 132 

 Root buds 134 



contraction 133 



Sandstone, Chonopectns 57 



Sanitation 1 



Sebaceous glands 193, 205, 206 pi. 



42, 45 

 Shadows in positive photography 



162 

 Shumard collection Ixii 

 Sleet-storm U3. pi. 10, 11 

 Sound xlvii, Ix 

 Southwestern flora lix 

 Stars, ages 1 



dark 42 



temperature 37 



Stolons 132 

 Substitution groups 1 

 Subterranean plant organs li, 131 

 Sudoriferous glands 193, 195, 205 



20e.pl. 37,42-46 

 Sun, age 11 



temperature xlvii, 1, 39 



Sweat glands 193, 195, 205, 206. pi, 



37, 42-45 



Tarsal tissne glands 190, 20i.pl. 

 33 



Tear glands 186, 195, 206. pi. 46- 



57 

 Temperature, law xlvii, 32 



solar 1, 39 



Terpenes liv 



Trains, friction on air Ix, 215 



Treasurer Ixix 



Tree propagation Ivi 



Voice Ivii 



Water bacteria Ixi 



filtration xlviii 



Weight of sleet 145 

 Wind vs. plants 149 

 vs. train friction 224 



X-ray photographs 161, 165 



Tandell collection Ixii 



Zero photographic plate ivii, 164 



