WATEK — SOILS. 



731 



quired to neutralize 100 cc. of the culture produced by various soil 

 organisms during different periods of growth. 



Free acid in cultures of different soil organisms stated in cubic centimeters of tenth-normal 

 sodium hydroxid required to neutralize 100 cc. of the cultures. 



Name of species. 



Bacterium my co ides. 

 Bacillus subtilifi 



Bacillus ptilvinatus . 



Bacterium fermentationis . 



BariUiis delnmrieDsis . 

 Jlniirriiini riidiiiliiiu .. 

 j;iiii,'n'iiiii (iiiihiiiiiii'm. 



BaciUa^^oli ...'. 



Microspiru tenuis 



In 2 per 

 cent fflucose 

 bouillon; 5 

 days' growth; 

 direct titra- 

 tion for free 

 acid. 



Cc. 



6.20 

 15.20 



In 2 per 



cent peptone 



broth, with 



an excess 



of chalk; 



4 weeks' 



growth; by 



distillation. 



Cc. 



G.32 

 9.80 



19.30 



In 4 per 

 cent glucose 



bouillon, 

 with an ex- 

 cess of chalk; 



4 weeks' 

 growth; by 

 distillation. 



In 2 per 

 cent glucose 

 bouillon; .'i 

 days' growth; 

 direct titra- 

 tion for free 

 acid. 



Cc. 



15.2 



16.0 



13.0 



11.8 



8.2 



12.1 



22.5 



17.0 



4.0 















12.0 

 12.0 



20.0 



12.0 



5.0 















Composition of the air at various altitudes, G. Hinrichs {Compt. Bend. Acad. 

 Sci. Paris, 131 {1900), x>P- 4-f^> 443; ahs. in Jour. Chem. Sac. ILondon'], 78 {1900), 

 No. 456, II, p. 649) . — Eeports calculations of the proportions of carbon dioxid, oxygen, 

 argon, nitrogen, and hydrogen at different altitudes. 



The regeneration of confined air by means of sodium dioxid, G. F. Jaubeet 

 {Compt. Ecnd. Acad. Sci. Fari.% 131 {1900), No. 18, pp. 715, 716).— This is a brief 

 note referring to the proposition of Desgrez and Balthazard (see below) to use sodium 

 dioxid to purify air vitiated by respiration, and calling attention to the work of the 

 author on this subject during the past 3 years. The principal ol^jection urged to the 

 use of sodium dioxid for this purpose is its high i^rice. 



The regeneration of confined air by means of sodium dioxid, Desgbez and 

 Balthazard {Compt. liend. Acad. Sci. Paris, 131 {1.900), No. 20, p. 812). — A reply 

 to the above referring to previous communications^ and denying Jaubert's claim to 

 priority. 



Well waters— a study, A. McGill {Trans. Ottawa Lit. and Sci. Soc, 1S99-1900, 

 No. 2, pp. 133-148, figs. 4). — This article discusses the origin and movement of ground 

 water, the origin and sources of contamination of well waters, and means of detect- 

 ing and preventing such contamination. 



On the presence of oxysulphocarbonates of iron in the water of the Rhone, 

 H. Causse {Comi)t. liend. Acad. Sri. Piri^, 131 {1900), No. 23, 2n>. 947-049). 



Underground temperature at Oxford in the year 1899 as determined by 

 five platinum resistance thermometers, A. A. Ra.mbant {Proc. Roy. S:>c. ILoii- 

 donl, 67 {1900), No. 437, pp. 218-222). — Observations with thermometers of the Cal- 

 lendar and Griffiths^ pattern at depths of 6J in., 1 ft. 6 m., 3 ft. 6J in., 5 ft. 8J in., 

 and 9 ft. 11 J in. are very briefly reported and discussed and the method of standard- 

 izing the apparatus is described. A comparison is made of the calculated and 

 observed results which seem to indicate a high degree of precision in the observa- 

 tions. 



1 Compt. Rend. Acad. Sci. Paris, 128 (1899), pp. 361-363; 131 (1900), No. 7, pp. 

 429-431. 



2 Nature, 53 (1895), pp. 39-46, figs. 4. 



