312 EXPERIMENT STATION EECORD. 



where, the conclusion is reached that the inefficiency of this method of protec- 

 tion against hail is clearly demonstrated. 



Meteorology in its relation to horticulture, R. H. Curtis {Jour. lioi/. Hort. 

 aS'oc, [Loiidoyi], S2 (1907), pp. inj,-112, fifi^. .?). — This is a general discussion of 

 the meterological elements which are of most direct interest to horticulturists 

 and the means of determining and interpreting them. 



Report on the phenological observations for 1906, E. Mawley (Quart. Jour. 

 Roy. Met. Soc. [London], 33 (1907), No. 1J,2, pp. 139-163, pi 1).—As usual in 

 these reports the leading climatic and phenological characteristics of the dif- 

 ferent seasons of the year are described and the seasonal growth of 13 selected 

 plants in different parts of England, Ireland, and Scotland are platted. The 

 data used were furnished by a large number of observers throughout the United 

 Kingdom. 



The psycho-physical aspect of climate, F. Peaese (Jour. Trop. Med. and 

 Hyg. [London]. 10 {1907), Xo. 1',. pp. 2-'i2, 2'i3). — Weekly averages for 24 years 

 of pressure, temperature, humidity, and rainfall at Calcutta are correlated with 

 the physical sensations which the different types of weather produce. 



A contribution to the climatology of the Canary Islands, O. Burchard 

 {Met. Ztschr., 2'i (1907). Xo. 2, pp. 6.',-7',. fig. i).— The leading climatic condi- 

 tions are described with a summary of the principal meteorological data involved. 



Climate of the wheat area of Central Canada (Quart. Jour. Roy. Met. Soc. 

 [London], 33 (1907). Xo. IJfl, p. ■')'>). — Tliis is an abstract of a paper by L. W. 

 Lyde presented at the York meeting of the British Association. It is explained 

 in general that this area has a typical continental climate modified by latitude 

 and lalves, a long summer day, slow rotation of earth, and chinook winds. 

 Spring is sudden and short ; summer is the rainy season, beginning with mid- 

 May rains and ceasing with mid-August dry spell ; autumn is a dry season ; the 

 winters are long and cold, but the colA. is not sufficiently intense to affect the 

 north limit of wheat in summer, although guaranteeing a cleansing of the 

 plowed lands. 



The climate of Peru, J. Hann (2Iet. Ztschr., 2', (1907), Xo. 6, pp. 270-279).— 

 The climatological conditions of Peru are summarized mainly on the basis of the 

 observations by Bailey (E. S. R.. 18. p. ()13) and I'ickering. 



The average duration of frosts on the earth, O. Dorscheid (Met. Ztschr., 

 2-', (1907), Xos. 1, lip. 11-21,, fig. 1; 2, pp. -'i9-6.',, pi. i).— Data bearing on this 

 subject from all parts of the world are summarized and discussed. A l)ibli- 

 ography of 55 references is also given. 



On the soot and smoke nuisance, M. Dennstedt and F. IIassler (Chem. 

 Ztg., 31 (1907), Xo. J,3, pp. 5.50, 551; abs. in Chem. ZentbL, 1907, II, Xo. 2, p. 

 J71f). — Analyses of 10 samples of hai'd-coal soot showed an average of 12.9 per 

 cent of ammonium sulphate, the amount var.^'ing from 1.9 per cent to 20.2 per 

 cent. The authors attribute the injurious effect of smoke and fumes mainly 

 to the presence of free sulphuric acid. 



Water resources of Georgia, B. M. and M. R. Hall (U. S. Geol. Survey, 

 Water-Supply and Irrig. Paper Xo. 197, pp. 342, pi. 1). — "It is the purpose of 

 this publication to present in a single volume the large amount of data relating 

 to the flow and power of Georgia streams resulting from the work of the water 

 resources branch of the United Stales Geological Survey, which was begun in 

 the year 1895. These data consist essentially of gage heights and discharge 

 measurements that can be used to show the continuous daily flow of the streams, 

 and of certain river profiles, in the form of tabulated elevations of water sur- 

 face at points along the river, that can be used to estimate the available fall at 

 any place. The amount of water flowing in the stream and the fall which can 



