METEOROLOGY — WATER , 1111 



The origin of atmospheric ozone and the causes of variation of carbon 

 dioxid in the air, II. IIknkikt and M. Bouyssy (Ann. Observ. Munic. (Ohserv. 

 Montsouri.s) [I'aris], (1908), No. 1-2, pp. 167-195).— Th\ii is a detailed ac- 

 count of investi.t;ati()ns, a brief rei)ort of which has already been noted (E. S. R., 

 2C). p. 422). 



Analyses of air, P. Miquel (Ann. Obsvrv. Munic. (Ohsrrv. Montfiouris) 

 [ I'd lis \. !) {I DOS). Xo. 1-2, pp. 7-28). — Numerous determinations of ozone and 

 carbcm dioxid in the free air and more detailed examinations of the confined air 

 of subways, tunnels, and buildings are reported. 



[Meteorological observations in Trinidad], J. H. Hart and H. Millen 

 (But. Dipt. Trinidad Ann. Rpt. 1908. pp. 2.^. 23, J^-J7 ) .—Tables are given which 

 show the monthly and annual rainfall at the Koyal Botanic Gardens from 1.SG2 

 to 1907; mean annual barometric pressure, temperature, and rainfall at the same 

 place, ISnS to 1!M»T: and observations on rainfall during 19(»7 at 50 stations in 

 Trinidad: besides miscellaneous meteorological observations during that year at 

 various stations in the island. The mean annual rainfall at the botanic gardens, 

 1802 to 1007, was 72.39 in.; for 20 years, 1888 to 1907, 66.0 in. The mean 

 barometric pressure for the 20 years, 1888 to 1907, was 29.90 in. ; the annual 

 temperature 78.50. 



The rainfall in Natal, E. Xevill (Natal Agr. Jour.. 11 (1908). No. 12, pp. 

 1531-1533). — Attention is called to the fact that there is a distinct IS-year 

 periodical tiuctuation in rainfall in Natal, the epochs of heaviest rainfall center- 

 ing around the years 1855-50, 1873-74. and 1S92-93. The indications point to a 

 similar exceptionally heavy rainfall centering around the year 1910-11. The 

 excess of rain is usually spread over a period of about 5 years. These periods 

 of excessive rainfall are attributed to the gradual northerly drift of the great 

 rain belt, the normal position of which is to the southeast of Cape Colony. 



It is noted also that these epochs of heavy rainfall coincide " with that of the 

 approach of the node of the moon's orbit to the i)osition of the vernal or spring 

 equinox, when the inclination of the plane of the moon's orbit to the plane of 

 the terrestrial equator reaches its maximum value, as if there were some con- 

 nection between the two occurrences, and this coincidence points to a possible 

 cause of this 18-year fluctuation in the rainfall. ... If the great rain belt 

 has any tendency to follow the deformation of the atmosphere under the attrac- 

 tion of the moon, as it should according to theory, then the greatest northerly 

 drift will occur when the moon's node approaches the vernal equinox, and this 

 is exactly what is indicated by the observations. It is to be noted that this is 

 purely a local cause affecting Southeast Africa, and not necessarily holding of 

 any other place. . . . 



" It is noteworthy that three 11 or 12 year solar periods of variation in 

 density of rain belt are not very different from two 18-year lunar periods, so 

 that every 35 or 36 years the two should coincide and give rise to a specially 

 heavy excess of rain, similar to that which is recorded by the observations. 

 Thus the excess of rainfall near 1855-56 and 1892-93 was much heavier than 

 that at the intermediate 18-year epoch in 1873-74. If this be so, the coming 

 heavy rains of 1910-11 will not be so heavy as those of either 1855-56 or 

 18! (2-93. " 



Contributions to hydrology, II, Dessoliers (Contributions Dirrrsrs d 

 r/fi/drofpncsr. Attjicrs, 1908. pp. I(;8. pis. .), fifjs. .',). — This is a series of articles 

 treating of sources and means of conserving and increasing the water supply. 



Underground waters of Georgia, S. W. McCallie (Choi. Sun-cy Oa. Bui. 

 15, pp. .no. Ills. 29, fiijs. 5, map /), — This report has an introductory chapter on 

 the general conditions controlling the amount of water taken up by soils, dis- 

 cusses briefly the physiograp'iy .ind geology of Georgia, and takes up in detail 



