General Index. 



231 



Photographic development in light 



lii, lvii, 161, 166 

 Photography lii, lv, lvi, lx, 151, 209 



pi. 12-17 

 Planets, temperature 41 

 Plates, light-struck 151 



zero lvii, 164 



Points, brilliant lxiii. pi. A 

 Positive photography lii, lvi, lx, 162, 



209 

 President lxvi 

 Pressure collectors 219 

 Propagation of trees lvi 



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 lxii 

 Sleet-storm 143. .pZ. 10, 11 

 Sound xlvii, lx 

 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 



206. pi. 37, 42-45 

 Sun, age 11 



temperature xlvii, 1, 39 



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



37, 42-45 



Tarsal tissue glands 190, 204. pi. 

 33 



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



57 

 Temperature, law xlvii, 32 



solar 1, 39 



Terpenes liv 



Trains, friction on air lx, 215 

 Treasurer lxix 

 Tree propagation lvi 



Voice lvii 



Water bacteria lxi 



filtration xlviii 



Weight of sleet 145 

 Wind vs. plants 149 

 vs. train friction 224 



X-ray photographs 161, 165 



Yandell collection lxii 



Zero photographic plate lvii, 164 



