Key to Subject Index of Experiment Station Literature. 



GENERAL SCIENCES 



(Includes only such general sub- 

 jects as can not conveniently be 

 indexed under the categories 

 relating directly to agricultural 

 and economic investigations) 



.1 Physics 

 .2 Chemistry 



.01 Physical 

 .02 Inorganic 

 .03 Organic 

 .04 Physiological 

 .05 Technical 

 .06 Analytical 



.001 Methods and apparatus 



.002 Analyses 



.3 Mineralogy. Geology 



.4 Botany 



.01 Systematic 



.03 Morphological and phys- 

 iological 



.03 Variations in plants 



.001 Crossing (including hy- 

 bridization) 

 .002 Acclimatization 



.5 Fermentation. Bacteri- 

 ology 



.6 Animal physiology 



.7 Zoology 



.8 Meteorology. Climatol- 

 ogy 



. AIR AND WATER 

 .1 Physics 

 .2 Chemistry 



(For methods of analysis, see 

 Chemistry, analytical) 



.3 Methods 

 tion 



3. SOILS 



of investiga- 



.1 History and classifica- 

 tion 



.2 Physics 



.3 Chemistry 



(For methods o£ analysis, see 

 CiiEMisi'KY, analytical) 



.4 Tillage 



.5 Reclamation and reno- 

 vation 



.6 Methods of investiga- 

 tion 



4. FERTILIZERS 



.1 History, nature, uses 

 .2 Farm manures 



(Animal and green manures, 

 composts, marls, muck, etc. ) 



.3 Commercial fertilizers 

 .4 Experiments 



(Deals with the fertilizers rather 

 than the crops grown. For fer- 

 tilizers for special crops, see 

 Field Crops, manuring, and 

 Horticulture.) 



.5 Inspection (laws, methods, 

 and general results) 



(For methods of analysis, see 

 Chemistry, analytical) 



5. PLANTS 



.1 Field crops 



.01 History and uses 



.02 Species and varieties 

 (especially descrip- 

 tions and comparative 

 tests) 



.03 Composition 



.04' Culture (adaptability to 

 localities, planting, ir- 

 rigation, cultivation, 

 harvesting, etc.) 



.05 Manuring (see also Fer- 

 ti 1 izers,experiments) 



.06 Curing and storage 



.07 Rotation 



.2 Horticulture 



.01 Vegetables 



.02 Orchard fruits 



.03 Small fruits 



.04 Grapes 



.05 Nuts 



.06 Ornamental horticulture 



.3 Forestry 



.4 Seeds 



.5 Weeds 



.6 Diseases of plants 



.01 Parasitic 



.001 Diseases due to vegeta- 

 ble organisms (fungi, 

 bacteria) 

 .002 Diseases due to animal 

 organisms 



(For diseases due to 

 insects, see Entomol- 

 ogy) 

 .02 Non-parasitic 

 .03 Remedies — Fungicides, 

 fungicide appliances.elc 



