II CONTENTS. [Vol. 3S 



Page. 



Research on the detection of added water in milk, Diirand and Stevenson .... 413 



Differentiation of coconut oil and palm-kernel oil in mixtures, Elsdon 413 



A combined Reichort-Polenske and Shrewsbury- Knapp proces.s, Elsdon 413 



Variation in the ether extract of silage, Haigh 413 



Constant temperature and humidity room for testing paper, Veitch and Reed. . 414 



A method for determining the absorbcncy of paper, Reed 414 



The cost of producing maple products in 1912 and 1913, Frink 414 



Vinegar from waste fruits, Cruess 414 



The canning industry. — Some accomplishments and opportunities, Baker 414 



METEOROLOGY. 



Climatic control of cropping systems and farm operations, Voorhees 414 



Climatic records in the trunks of trees, Douglass 415 



The pleionian cycle of climatic fluctuations, Arctowski 415 



Soil moisture and temperature factors in winterkilling of grain crops, Salmon. . 415 



Tropical rains: Their duration, frequency, and intensity, Fassig 415 



Frost in the United States, Reed 415 



Snow surveying: Its problems and their present phases. Church, jr 416 



Snow and its value to the farmer, Palmer 416 



Nitrogen, chlorin, and sulphates in rain and snow, Peck 416 



Weather review for 1914 and 1915, Esten 416 



Annual report of Iowa weather and crop bureau for 1916, Chappel 416 



Meteorological review, Flammarion 417 



SOILS — FERTILIZERS. 



Movement of soluble salts through soils, McCool and Wheeling 417 



Excess soluble salts in humid soils, Conner 418 



Lysimeter investigations. Dean i 418 



Experiments in methods for determining the reaction of soils, Christensen. . . 419 



Nitrogen-fixing bacteria in water and the soil beneath the water, Fischer 419 



Microorganisms of waste and cultivated peat soils, Arnd 420 



Soil sterilization, Ockerblad, jr 420 



The equilibrium between the nitrogen and carbon in the soil, Felber 421 



The humus content of the soil, Wheeler 421 



Soil survey of the Riverside area, Cal. , Nelson et al 421 



Soil survey of Bottineau County, N. Dak., Cobb et al 422 



Soil survey of San Saba County, Tex., Veatch et al 422 



Erosion of Kansas soils, Throckmorton 422 



Soil improvement, Allen 422 



Concerning farm manures, Burdick 423 



The manufacture of commercial fertilizers. Hills 423 



Sterilized animal meal 423 



The fixation of nitrogen, Bucher 423 



The synthesis of ammonia by the Haber process, Davis and Bryan 423 



Making available the organic nitrogen of leather, hair, etc . , Rose 423 



Solubility of mineral phosphates and superphosphates in dilute acids, Aita 423 



Trials with tetraphosphate in Piedmont rice fields, Marcarelli and Novell! . . . . 424 



WTiat we are doing toward remedying the potash shortage, Meade 424 



A new source of potash, Cranfield 424 



Commercial fertilizers, Hibbard 425 



Fertilizer analyses, McDonnell et al 425 



Commercial fertilizers. Hills, Jones, and Anderson 425 



AGRICULTURAL BOTANY. 



Plant associations of western Pennsylvania, II, Cril)bs 425 



A list of Japanese fungi, Shirai and Miyake 426 



Self -sterility , Moore 426 



Artificial production of galls, Molliard 426 



The movement of chromatophores, Sauvageau 426 



Physiology and biology of nitrogen-fixing bacteria, Omelianskii 426 



Nitrogen fixation and consumption of non-nitrogenous substances, Omelianskii. 426 



Fixation of atmospheric nitrogen by mixed cultures, Omelianskii 427 



Nitrogen-fixing bacteria in Russian soils, Omelianskii and Solunskov 428 



