244 SOIL SCIENCE [Bot. Absts., Vol. IV, 



1622. Ewart, A. J. The cause of bitter rot. Proc. Roy. Soc. Victoria (N. S.) 30 1 : 15-20. 

 1917. [Received in 1919.]— See Bot. Absts. 4, Entry 12S1. 



1623. Lego, Albert Tom. The preparation of silica jelly for use as a bacteriological 

 medium. Biochem. Jour. 13: 107-110. 1919. — An attempt is made to standardize the prepa- 

 ration of silica jelly so as to obtain uniform results. A clear and detailed description is given 

 of the preparation of collodion membranes and of each step in the subsequent procedure in 

 the formation of a uniform jelly. The critical factors pointed out are: (1) The use of a mem- 

 brane of standard permeability, (2) a sufficiently long period for the sodium silicate and 

 HC1 to react after mixing, and (3) tubing the medium as quickly as possible after removal 

 from the membrane and immediate autoclaving. — A. R. Davis. 



1624. Osborne, W. A. A contribution to the theory of gel structure. Proc. Roy. Soc. 

 Victoria (N. S.) 30: 153-158. 1918. [Received 1919.] (Contains papers read Sept. to Dec, 

 1917.) 



1625. Rands, R. D. De bruine binnenbastziekte van Hevea Brasiliensis (Voorloopige 

 mededeeling.) [The brown bast disease of Hevea Brasiliensis.] Arch. Rubbercult. Neder- 

 landsch-Indie 3 : 156-159. 1919.— See Bot, Absts. 3, Entry 2732. 



1626. Schultz, T. S., Donald Folsom, F. Merrill Hildebrandt, and Lon A. Hawkins. 

 Investigations on the mosaic disease of the Irish potato. Jour. Agric. Res. 17:247-273. PI. 

 A, B, and 25-80. 1919— See Bot. Absts. 3, Entry 2755. 



1627. Simmons, J. E. A comparison, with the standard plate methods, of some rapid 

 methods for bacteriologic analysis of milk. Jour. Infect. Diseases 24: 322-336. 1919. — A large 

 number of milks, varying in bacterial count from 50-160,000,000 per cc. were analyzed by 

 5 different methods: direct microscopic, standard plate, lactose plate, little plate (Frost) 

 and reduction test. When the bacterial content of a milk was low (less than a million), all 

 of the methods used gave satisfactory results, except the direct microsopic count; when the 

 bacterial content of the milk was high, the direct microscopic method for the reduction test 

 served best. The little plate furnished results in one-eighth to one-fifth of the time required 

 by the other culture methods. — Selman A. Waksman. 



1628. Talbot, H.W. Definition of peat. Jour. Amer. Peat Soc. 12: 212. 1919.— See Bot. 

 Absts. 4, Entry 1687. 



1629. Van Slyke, H. D., and H. A. Salvesen. The determination of carbon monoxide 

 in blood. Jour. Biol. Chem. 40: 103-107. 1919. 



SOIL SCIENCE 



J. J. Skinner, Editor 

 F. M. Schertz, Assistant Editor 



GENERAL 



1630. Allen, E. R., and B. S. Da visson. An all-glass nitrogen apparatus. Ann. Missouri 

 Bot. Gard. 6:45-48. PI. 2. 1919— See Bot. Absts. 4, Entry 14S6. 



1631. Burd, John S. Rate of adsorption of soil constituents at successive stages of plant 

 growth. Jour. Agric. Res. 18:51-72. Fig. 1-13. 1919.— See Bot. Absts. 4, Entry 1420. 



1632. Carr, R. H. Vegetative growth in soils containing crude petroleum. Soil Sci. 7: 

 67-68. 1919.— Crude oil in amounts up to 27,000 pounds per acre has but little effect on the 

 growth of soy beans in the soil tested. Larger amounts decreased the growth. The smaller 

 amounts apparently favored nodule production and up to 72,000 pounds per acre did not com- 





