WATER SOILS. 949 



based on actual observation to show tliat barometric variations are of <rreat value 

 in forecasting, since it is claimed that by their means the centers of hijjli or low 

 pressure may be predicted from 12 to 24 hours in advance; they aid in fixing the 

 trajectories of cyclonic and anti-cyclonic centers; and they are of use in forecasting 

 temperature changes and in predicting tlu' north and scjutb winds of northern 

 Mexico and the Gulf region. 



WATER— SOILS. 



Water supply and. sewerage {Ma-smchmellti SUiie lid. Health Rpt. 1901, pp. 1- 

 393). — This includes advice to cities and towns on water supply, sewage dispo.sal, 

 etc.; the results of chemical (and in some cases micros(;opical) examination of water 

 supplies and rivers; and accounts of experiments on sewage jniritication and 

 bacteriological studies at the Lawrence Experiment Station. 



Purification of river water, A. J. J. Vandevei.de and F. Lepekke {licpriul from 

 Iliuuh'l. Zfsde VUKumch Xdtitnr- en. (,'e)ieesL: (oikj., Kortrijk, 1902, pp. ll,fig.s.3). 



The hydrography of Garrett County, Maryland, H. A. Pressey and E. G. 

 FavJ- {31arijla7id Geological .Survey: Garrett County. Baltimore: Johm Hopkim Pre.'<.^, 

 1902, pp. 275-2S9, ])l. 1, ff/fi. 3). — A summary of available data on this subject. 



The hydrography of 'Cecil County, Maryland, H. A. Pressey {Maryland Geo- 

 logical Survey: Cecil County. Baltimore: Johns Ilopjkin.'i Prex.^, 1902, pp. 203-287, pi. 1, 

 tigs. 8). — A summary of available data on this subject is given in tables and diagrams. 



On the processes of mineralization of water as related to the geological 

 character of soils and rocks, E. Oasokia (Ann. R. Si-mihi Snperiore Age. Purliei, 

 2. .sn-., 4 {lOO.i), pp. 197). 



Observations on soil moisture in New^ Mexico from the hygienic view^ 

 point, C. E. Magnusson {Bnl. Hadley Climat. Lab. Univ. New Mexico, 3 [1902), No. 4, 

 pp. 8). — Observations with Whitney's electrical apparatus and by means of direct 

 determination (drying) are recorded for a period of about one year and the results 

 are discussed with reference to health. 



An experiment on soil improvement, C. S. Phelps ( Conneeticid Stores Sta. lijit. 

 1901, pp. 148-153). — A brief account is given of a continuation ( if a rotation experiment 

 begun in 1899 (E. S. R., 13, p. 935). "The experiment on soil improvement in 1900 

 was with potatoes and that of 1901 with oat and pea hay. In both years the yield 

 was largest on the plat with the complete fertilizer, but in jiroportion to the cost of 

 fertilizing the two yjlats the yield on the plat with the staljle manure was fully as 

 economically produced. In 1900 the yield from the plat with clover for manure was 

 next in size to that from the plat with the complete fertilizer, and the yield from the 

 plat "with the minerals and clover for fertilizer was jjractically the same as that from 

 the stable manure. In 1901 the yields of oat and pea hay where a liglit growth of 

 vetch was plowed under, either alone or in cond3ination with the mineral fertilizers, 

 were much smaller than those where stable manure was used. In both years the 

 yield on the plat where rye was plowed under in addition to the nnnerals was less 

 than those from the plats on either side where the legumes were used. The results 

 of both years indicate a considerable advantage in the use of legumes for green 

 manure. On the whule, connnon red clover seems to be the best crop for the pur- 

 pose of green manuring when it must be grown between the regular crops of a 

 rotation, as in the experiment here described." 



Experiments on black marsh soils, A. P. Whitson {Wisconsin Sta. Rpt. 1902, 

 pp. 210-216, figs. 2). — In continuation of previous investigations (E. S. R., 13, p. 

 931), experiments were made on black marsh soils in 1901 (1) in cylinders which 

 showed that green manure was nearly as effective as potash for corn on such soils; 

 (2) in cylinders and in the field which showed that "the effect of potassium sul- 

 phate is limited to the first crop, while manure may influence the second crop largely 

 and the third somewhat. With the ordinary distance of planting of corn, 50 to 75 



