890 EXPERIMENT STATION RECORD. [Vol.38 



were isolated and apparently deserve recognition as the etiological factor in 

 roup. This organism was recognized in smears from all cases of diphtheria and 

 ocular roup examined. It was grown upon artificial media and the disease again 

 reproduced, and a high degree of protection was shown against the natural dis- 

 ease after immunization with pure cultures. A bibliography is appended. 



A further study of the etiolog'y of roup in fowls, J. G. Jackley {Jour. 

 Amer. Vet. Med. Assoc, 52 (WIS), No. 7, pp. 858-858, fig. i).— Additional re- 

 sults obtained in the work above noted further support the claim that a bac- 

 terium of the Pasteurella group isolated by the author is the etiological factor 

 in roup. 



RURAL ENGINEERING. 



Surface water supply of North Atlantic slope basins, 1916 {XJ. 8. Geol. 

 Survey, Water-Supply Paper 431 (1918), pp. lie+XXXVI, pis. 2).— This re- 

 port, prepared in cooperation with the States of Maine, Vermont, Massachu- 

 setts, and New York, presents the results of measurements of flow made on 

 the St. John, Machias, Union, Penobscot, Kennebec, Androscoggin, Presumpscot, 

 Saco, Merrimac, Blackstone, Connecticut Housatonic, Hudson, Delaware, Sus- 

 quehanna, Patuxent, Potomac, and Rappahannock River Basins during 191Q^ 

 Lists of the steam-gauging stations and the publications of the Geological 

 Survey relating to water resources for this region are appended. 



Surface water supply of the lower Mississippi River Basin, 1916 {U. S. 

 Geol. Survey, Water-Supply Paper 487 {1918), pp. 50-\-XXXII, pis, 2).— This 

 report presents the results of measurements of flow made on tlie Arkansas and 

 Red River Basins during 1916. A section on stream-gauging stations and publi- 

 cations relating to water resources is appended. 



Surface water supply of Hawaii, 1916 {TJ. S. Geol. Surrey, Water-Supply 

 Paper Iilf5 {1917), pp. 224). — This report, prepared in cooperation with the 

 Territory of Hawaii, presents the results of measurements of flow made on 

 certain streams and ditches and rainfall records of the islands of Kauai, Oahu, 

 Maui, and Hawaii for 1016. 



Southern California floods of January, 1916, H. D. McGlashan and F. C. 

 Ebekt {U. S. Geol. Survey, Water-Supply Paper 426 {1918). pp. 80, pis. 16, map 

 1). — This report, prepared in cooperation with the State of California, presents 

 precipitation records, describes the flood of January, 1916, and reports measure- 

 ments of flood run-off in tlie various river basins within the flood area. 



Rapid chemical determination of the potability of water, Comte {Jour. 

 Pharm. et Chivi., 7. ser., 14 {1916), No. 5, pp. 185-140; abs. in Chem. Abs., 11 

 {1917), No. 7, p. 857). — It was found that, as a result of the examination of 

 more than 250 samples of water in the Argonne region of France, in impure 

 waters the amounts of nitrites in the same specimen may double in 24 hours 

 at laboratory temperature while pure waters show no such variation. The 

 maximum action is reached in 48 hours. Two nitrite determinations are made, 

 one at once and the other on the same sample after 24 hours. By this method 

 even a very slight microbic action may be detected. 



" The waters of the Argonne region are graded as follows : Good waters — 

 NaCl, below 12 mg. per liter ; NHs, below 0.05 mg. ; oxygen consumption, below 

 1.2 mg. ; nitrites calculated as KNO2, below 0.03 mg. if there is no variation 

 after 24 hours. Suspected waters— NaCl, 12 to 20 mg. ; NH3, 0.05 to 0.1 mg. ; 

 oxygen consumption, 1.2 to 2.5 mg. ; nitrites, 0.03 to 0.1 mg. ; if the amount 

 varies in the same sample within 24 hours, the limits are to 0.03 mg. Bad 

 waters contain — NaCl, above 20 mg. per liter; NHs, above 0.1 mg. ; oxygen con- 

 sumption, above 2.5 mg. ; nitrites, above 0.1 mg. ; if there is appreciable varia- 



