I N D 1^. X . 



Agar, beef, medium for development of bacteria ",24 



Alkali, black. See Sodium carbonate. 



relation c,f chlorids and sulphates to nitrifying power 21-22 



Ammonification, definition of term 7 



measurement of power of soil flora at Fallon, Nev 30, 31 



methods of determination in soil studies at Fallon, Nev 9, 30 



Anmioniuni sulphate, use in soil studies at Fallon, Nev 10, 12-22, 27, 29 



Analysis, chemical, methods employed in soil studies at.Fallon, Nev 10-11, 



26-27, 30, 31 



Bacteria, colonies peculiar to certain soils at Fallon, Nev 32 



counts, methods used in soil studies at Fallon, Nev 9, 10, 26-27 



nitrifying, comparative action in soil and in solution, at Fallon, Nev. 30 

 number and distribution, relation to character of soil, at Fallon, 



Nev 24-25,32 



Black alkali. See Sodium carbonate. 



Brown, P. E., and Lipman, J. G., on methods and results of soil studies 9, 30 



Calcium sulphate, effect upon soil samples at Fallon, Nev 26, 27-28, 29 



( 'hemical anaylsis. See Analysis, chemical. 



( 'hester, F. D., on the bacteriological analysis of soils 24 



Clay, colloidal, affected by calcium sulphate and gypsum at Fallon, Nev 26 



occurrence in soil samples at Fallon, Nev 10 



Conclusions of bulletin 32-33 



Decomposition, organic, product peculiar to poor soil at Fallon, Nev 26 



Denitrification, definition of term 7, 31 



methods of study employed at Fallon, Nev 11, 22-24, 31 



Dipotassiuni i)hosphate, use in ])eptone solutions at P'allon, Nev 9 



Dunham's peptone solution. See Peptone, Dunham's solution. 



Extract, soil, method of preparation 10 



Failyer, G. H., and Schreiner, Oswald, on analyses of soils U 



Fallon, Nev., locality of investigations in soil bacteriology. . . 7, 8, 11, 18, 20, 24, 25, 33 



Filtration of soil extracts, Fallon, Nev 10 



Gypsum, effect upon colloidal clays, at Fallon, Nev 26 



Humifieation, imjwrtance of investigations at Fallon, Nev 33 



Introduction to bulletin 7-8 



Investigations, bacteriological, methods employed at Fallon, Nev 8-11, 



22,26-27,30,31 

 Jensen, C. A., determination of chlorids and sulphates in soil at Fallon, Nev. . . 11, 16 



Lipman, J . G., and Brown, P. E., on methods and results of soil studies 9, 30 



\'oorhees, E. B., on investigations in soil bacteriology 24 



on bacteriological investigations 9 



use of dried blood as a source of niti-ogen 30 



Lohnis, F., on bacteriological investigations 9, 24 



Magnesium sulphate, use in peptone solutions at Fallon, Nev 9 



Methods of bacteriological investigation. See Investigations. 



Micro-organisms, relation to soil study at Fallon, Nev 7, 8-9 



211 35 



