116 EXPERIMENT STATION RECORD. [Vol. 37 



of Air Temperatures at Swedish Stations to a True Mean, by N. Ekliolm ; 

 Formation of Winter Stratus, Depth of Northeast Wind, by D. Manning; 

 Atmospheric Circulation and the Weather in Argentina, by H. H. Clayton ; 

 The Argentine Meteorological Service : and Report of the Meteorological Sta- 

 tion at Berljeley, Cal., for the Year Ending June 30, 1915 (illus.), by W. G. 

 Reed. 



Climatological data for the United States by sections (U. S. Dept. Agr., 

 Weather Bur. Climat. Data, 4 (1917), Nos. 1, pp. 238, pis. 2, figs. 4; pp. 2^6. 

 pis. 2, figs. 7). — These volumes contain brief summaries and detailed tabular 

 statements of climatological data for each State for January and February, 

 1917, respectively. 



Meteorological records (Hatcaii Sta. Rpt. 1916, p. iS). — Monthly summaries 

 of observations from January 1 to June 30, 1916, on temperature, precipitation, 

 and rainy and clear days at the Glenwood substation, Hawaii, are tabulated. 



Meteorological observations at the Massachusetts Agricultural Experi- 

 ment Station, J. E. Ostrander and W. P. Saundkrs (Massachusetts Sta. Met. 

 Bills. 339-SJfO (1917), pp. 4 carh). — Summaries of observations at Amherst, 

 Mass., on pressure, temperature, humidity, precipitation, wind, sunshine, cloudi- 

 ness, and casual phenomena during March and April, 1917, are presented. The 

 data are briefly discussed In general notes on the weather of each month. 



Free-air data at Drexel aerological station: January. February, and March, 

 1916 (U. S. Mo. ^yeather Rev., Sup. 5 (1917), pp. 59, pis. 5).— The ii'sults of 138 

 free-air observations at Drexel, Nebr., by moans of kites are reported in detail. 

 '• The means of the highest points reached with the kites are 2,722 meters 

 above sea level in January, 2.809 in February, 2,631 In March, and 2,731 for 

 the period." 



Ammonia in dew (Met. Off. [Ot. Brit.] Circ. 7 (1916), p. 4; U. S. Mo. 

 Weather Rrv., 45 (1917), No. 1, p. 19). — Samples of dew collected on glass plates 

 12 in. square exposed 1 ft. above the ground over grass land in fine weather 

 from September 23 to December 6, 1914, and within one hour of sunrise, showed 

 no nitrates, traces of chlorids, and a comparatively large proportion of am- 

 monia, namely, 7.5 and 5 parts by weight In 1.000,000, respectively. 



SOILS— FERTILIZERS. 



The water content of the soil and the composition and concentration of 

 the soil solution as indicated by the freezing-point lowerings of the roots 

 and tops of plans, M. M. McCooi. and C. E. Millar (.Soi7 Sci., S (1917), Xo. 2, 

 pp. IIS-ISS). — This paper, prepared at the Michigan Experiment Station, pre- 

 sents the principal results of greenhouse and field .studies on the concentration 

 and composition of the soil solution, the water content of soils, and the rate 

 of water movement in soils as measured by the freezing point lowerings of the 

 roots and leaves of plants. Several different soils and plants were used. 



It was found that " consistent determinations of the freezing-point depression 

 of plant tissue may be obtained by In.serting the thermometer directly into 

 material triturated in the freezing tube. Results with material repeatedly 

 reduced to the point of solidification, repeatedly frozen at low temperatures, 

 and material frozen at low temperatures and macerated or triturated were 

 essentially the same as those obtained by direct freezing of the triturated 

 material. 



" The freezing-point depression of sap expressed under great pressure from 

 the aerial portion of the plants sludle<l, previously frozen at low temperatures, 

 was practically the same as that of the material frozen directly, but greater 

 If the pressure is not so great. The freezing-point depressions of the juice 



