316 EXrEKIMKNT STATION KECOKD. 



furnislie.s u continuous current and will keep the armature in this position until the 



circuit is ))roken. When the circuit is broken by the mercury faUing below the 



lower point of the wire in the thermometer the armature will be drawn by the 

 spring against the screw S, which puts the bell in a circuit with the battery." 



The use of the ordinary differential thermometer in the above appa- 

 ratus is explained and one form of thermostat is described, but ther- 

 mostats are not considered reliable for the purpose of frost warnings. 



A study on hail. Protection of crops by cannonading, V. Ver- 

 MOKEL {Etude nui' lu (/t'ele. l)(ifen>ic des recoltts par Ic tlr da canon. 

 Mcmtpellier: Coulet <& Sons, 1900, pp. 78, figs. IJ4). — This pamphlet 

 discusses the various theories of the formation of hail, the explosives 

 and cannon used and how the explosions operate to prevent hail, the 

 results obtained in different countries, and the organization of sta- 

 tions; and gives the statutes of the cantons of Villefranche and Anse 

 against hail, and titles of 103 papers on the subject. The author 

 claims the results already obtained conclusively prove the effectiveness 

 of this means of preventing destructive hailstorms. The detailed 

 results of numerous experiments are reserved for a future publication. 



Meteorological records, J. E. Boxebright {Idaho Sta. Bui. 2S, pp. 129-133). — 

 Monthly and yearly summaries of observations at Moscow, Idaho, on temperature, 

 pressure, precipitation, cloudiness, and dates of latest frosts in spring and earliest in 

 autumn during 1898 and 1899; and a summary of similar observations during 5 years 

 (1895-1899). 



The mean temperature for 1899 was 44.8° F., for the 5 years (1895-1899) 45.1°; 

 the highest temperature for 5 years was 100°, the lowest — 17°. The mean pressure 

 for 1899 was 27.25 in., for 5 years 27.33. The rainfall in 1899 was 20.12 in., melted 

 snow 3.35 in.; during 5 years 19.02 and 4.37 in. resi)ectively. The average number 

 of clear days (per year) during 5 years was 180, during 1899 171. The latest killing 

 frost in the spring occurred May 17, the earliest in the fall October 2, in 1899; the 

 latest frost in spring during 5 years occurred May 30, 1898, the earliest in the fall 

 Sept end )er 0, 1895. 



Meteorolog'ical observations, J. E. Ostkander and A. C. Monahan {Massachu- 

 setts Hatch. Sta. Md. Bnls. 136, 137, 138, pp. 4 each). — Summaries of observations on 

 pressure, temperature, humidity, precipitation, wind, sunshine, cloudiness, and 

 casual phenomena during April, May, and June. The data are briefly discussed in 

 general notes on the weather of eat-li month. 



Report of precipitation and temperatures for the year 1899, J. B. Reynolds 

 {Ontario Ayr. Col. and Expt. Farm Rpt. 1899, jtp. 28, 29). — A monthly summary of 

 observations at Guelph. "The highest temperature recorded at the college for the 

 year was 95° on August 19. The lowest was 20.5° below zero on February 12. The 

 amount of precipitation for the year, including rain and melted snow, was very 

 nearly 20 in." 



Monthly summaries of meteorological observations made at Leon ( Guan- 

 ajuata) during 20 years, 1878-1897, M. Leal {Mem. y Rev. Soc. Cient. "Anto- 

 nl(j Alzate," I4 {1899-1900), Xo. 0, />. 264). — A summary of observations on pressure, 

 temperature, rainfall, evaporation, humidity, cloudiness, direction and velocity of 

 the wind, oti-. 



Some facts about the climate of Tennessee, W. M. Fulton ( Tennessee Sta. Bid. 

 ]'(>!. Xlll, No. 1, pp. 13-16, charts 2). — This arficle discusses briefly temperature, 

 rainfall, and length of the growing season in different parts of the State. 



