248 Miscellaneous Intelligence. 
That of the Pecos is not more a four feet to the mile. 
The Canadian, from the mouth of the a creek for two 
hundred miles eastward, is nine feet od the mile. 
The Arkansas, from the mouth of the Apishpa river to Fort 
Atkinson, eight or nine feet. 
The South Platte, from Denver to its junction with the North 
Platte, is nine or ten feet to the mile; while that of ines North 
Platte, from Fort Fetterman to the e junction, is onl n feet. 
The Platte below the junction has an average descent of “aboxl six 
feet to the mile. 
The fall of the Missouri river, from Fort Benton to the mouth 
of the Yellowstone, is about two feet to the mile; and from the 
latter tee to its mouth, near St. Louis, it averages a fraction less 
than one 
Snake siver, from the mouth of Ross’s Fork, north, about six 
feet to the mile. 
ishing the barometric pressure, the direct cause is the deficiency 
of oxygen, = that an animal that will die with the pressure 
reduced to 18 cm. (7 inches) will endure a reduction to 6 cm. 
(2°4 inches) before life is extinet, if oxygen be added. And the 
converse is also true that the evil of too great pressure comes 
mainly from the too large amount in that case of oxygen, dilution 
with nitrogen prolonging life. He remarks that workmen em 
ployed at great elevations would accordingly find benefit in an 
arrangement for supplying more oxygen; and those occupied i In 
diving for — ete. ne a contrivance for supplying nitrogen.— 
Les Mondes, July 
3. The e Temperatu ure and Rainfall v. July, 1872; by C. Kev 
GEN, Jr., Meteorologist to the Board of Health, County of Rich 
mond (Staten Island), N. Y. (Communicated for this Journal.) 
e month of July, 1872, exhibited the highest temperature 
and greatest rainfall ‘ever recorde = this island, for any one 
nth ture mean was 781, the maximum 96, 2 and 
she minimum 64°2 degrees. The total vainfall amounted to 1134 
waclp ee 
12mo, pp. ae allo gis books are deservedly in hg 
mation ee tage a doubt which a word of affirmative stateme? 
would remove. 
