86 



SCIENCE 



[N. S. Vol. XXXVI. No. 916 



Streams; Dilution in Large Lakes; Dilution 

 in Oceans and Tidal Estuaries; Sewage 

 Treatment Works; Screening; Plain Sedi- 

 mentation; Septicization in Connection with 

 Sedimentation; Chemical Precipitation in 

 Conjunction with Sedimentation; Electro- 

 lytic Treatment; Strainers, Slate Beds and 

 Colloidors; Broad Irrigation; Intermittent 

 Sand Filtration; Contact Filters; Sprinkling 

 Filters; Aeration; Hypochlorite Treatment; 

 Ozonization; Institutional and Eesidential 

 Plants ; Comparative Summary. 



It will be noticed that some of the newer 

 processes, such as ozonization, the use of 

 eleetrolytically prepared hsrpochlorite, etc., are 

 also gone into, but with reservations as to 

 their probable utility. In the description of 

 processes, emphasis has been placed on the 

 underlying principles and on the efficiencies 

 obtained by their application, while structures 

 have been described only to a limited extent 

 and the illustrations are relatively meager, 

 The subject of cost is also one that has not 

 been elaborated. 



Geoege C. Whipple 



SCIENTIFIC JOURNALS AND ABTICLES 



The contents of the American Journal of 

 Science for July are : 



' ' Storm King Crossing of the Hudson River, by 

 the New Catskill Aqueduct, of New York City," 

 J. F. Kemp. 



"Lake Parinacochas and the Composition of its 

 Water," G. S. Jamieson and H. Bingham. 



' ' Shell Heaps of Maine, " F. B. Loomis and D. 

 B. Young. 



"Mixtures of Amorphous Sulphur and Selenium 

 as Immersion Media for the Determination of 

 High Eefractive Indices with the Microscope," 

 H. E. Merwin and E. S. Larsen. 



"Asymmetry in the Distribution of Secondary 

 Cathode Bays produced by X-rays; and its De- 

 pendence on the Penetrating Power of the Exciting 

 Bays," C. D. Cooksey. 



"Derivation of the Fundamental Relations of 

 Electrodynamics from those of Electrostatics," 

 L. Page. 



' ' Hydrolysis of Esters of Substituted Aliphatic 

 Acids," W. A. Drushell. 



"Some Suggested New Physiographic Terms," 

 DeL. D. Cairnes. 



The following articles are printed in the 

 Journal of Genetics for June: 



"Species Hybrids of Digitalis," W. Neilson 

 Jones. 



"Notes on Inheritance of Color and other Char- 

 acters in Pigeons, ' ' L. Doncaster. 



' ' On Heterochromia Iridis in Man and Animals 

 from the Genetic Point of View," C. J. Bond. 



' ' Second Report on the Inheritance of Color in 

 Pigeons, together with an Account of some Experi- 

 ments on the Crossing of certain Races of Doves, 

 with special reference to Sex -limited Inheritance, ' ' 

 Richard Staples-Browne. 



"Gigantism in Primula sinensis," Frederick 

 Keeble. 



MECENI WOBK IN SYSTEMATIC 



AGMOSTOLOGY 



Beitrage zur Gramineenfiora von Misiones: 



E. L. Ekman (Arkiv f. BotaniJc, 11: no. 4. 



1912). 



The author visited for three months in 

 1907-08, Misiones, that portion of Argen- 

 tina lying between Uruguay and Paraguay. 

 The above article is a critical account of the 

 grasses collected at this time. The author 

 enumerates 125 species and gives a table show- 

 ing the relation of these to the surrounding 

 regions. The larger genera are Panicum 27 

 species (23 species as the genus is limited by 

 Hitchcock and Chase), Paspalum 19 species 

 and Andropogon 14 species (including Sor- 

 ghum, Sorghastrum and Heteropogon). There 

 are four beautiful plates, taken from photo- 

 graphs, by the gelatin process, and illustrating 

 the inflorescence, the details of which are ex- 

 cellently shown. The work inspires confidence 

 from the incorporation of numerous critical 

 notes. It is interesting to note that the 

 anomalous Lepiochloa spicata is transferred 

 to the genus Tripogon, a disposition which is 

 well supported by evidence. The descriptions 

 of new species are in Latin, the notes in Ger- 

 man. 



The Grama Grasses: David Griffiths (Gontr. 

 Nat. Herh., 14: 343-428, 1912). 

 This was reviewed recently by Dr. Bessey' 



' Science, April 12, 1912, p. 590. 



