SCIENCE-ABYEUTISEMENTS 



RECENT ISSUES 



IN GEOLOGY 



The Briones Formation of Middle 

 California, by Parker D. Trask. 

 Price, 75 cents. 



Genesis of the Ores of the Cobalt 

 District, Ontario, Canada, by Al- 

 fred R. Whitman. Price, 80 

 cents. 



Geology of the Cuyamaca Region of 

 California with special reference 

 ito the origin of the nickeliferous 

 pyrrhotite, by F. S. Hudson- 

 Price, $1.25. 



University of California Press 



Berkeley, California. 



CARNEGIE INSTITUTION OF WASHINGTON 

 Publications o( DepEirtnient of Marine Biology 



The Institution, from 1906 to 1922, has issued 

 17 volumes of papers from the Department of 

 Marine Biology, of which the late Alfred G. 

 Mayor was the Director. These volumes contain 

 112 separate papers, aggregating 3,556 pages, 537 

 plates, and 1,000 text-figures. Besides these, Dr. 

 Mayor was the author of a monograph, in 3 quarto 

 volumes, on "The Medusae of the World," issued 

 in 191 1, with 738 pages, 76 colored plates, and 428 

 text-figures. Another volume (publication No. 

 312), containing articles on similar researches, is 

 now in press, as follows : 



Tennent, D. H.— Studies of the Hybridization of Echinoids. 

 Harvey, E. N.— Production of Light by the Fishes 



Photoblepharon and Aruimalops. 

 Mayor, A. G. — Hydrogen-ion Concentration and Electri- 

 il Conductivity of the Surface Water of the Atlantic 



and Pa 



Wells, R. C— The Carbon-Dioxide Content of Sea-Water 

 at Tortugas, Florida. 



Phillips, A. H.— Analytical Search for Metals in Tortug.is 

 Marine Organisms. 



Fowler, H. W., and C. F. Silvester.— A Cdllection of Fishes 

 from Samoa. 



Mayor, A. G.— Tracking Instinct in a Tortugas Ant. 



Treadwell, A. L. — Leodicidae from Fiji and Samoa. 



Treadwell, A. L.— Polycha:tous x\nna!lids Collected at Fri- 

 day Harbor, Washington. 



More complete information concerning the publications of 



this Department, lists of titles, prices, etc., may be 



obtained by addressing: 



CARNEGIE INSTITUTION OF WASHINGTON 



WASHINGTON, D. C, U. S. A. 



THE JOURNAL OF GENERAL PHYSIOLOGY 



Edited by 

 JACQUES LOEB, New York, N. Y. W. J. V. OSTERHOUT, Cambridge, Mass. 



CONTENTS OF VOLUME IV, NO. 6, JULY 20, 1922 



NORTHROP, JOHN H. The st 

 suspensions. I. A convenient c 

 cataphoresis experiments. 



NORTHROP, JOHN H.. and CULLEN, GLENN E. 

 An apparatus lor macroscopic cataphoresis experi- 



of bacterial 

 microscopic 



for absolute quantities of car- 



COHN, EDWIN JOSEPH. Studies in the physical 

 chemistry of the proteins. I. The solubility of cer- 

 tain proteins at their isoelectric points. 



NORTHROP, JOHN H., and DeKRUIF, PAUL H. 

 The stability of bacterial suspensions. II. The ag- 

 glutination of the bacillus of rabbit septicemia and 

 of Bacillus typhosus by electrolytes. 



NORTHROP, JOHN H., and 

 The stability of bacterial s 

 glutination in the presence 

 serum, and 



DeKRUIF, PAUL H. 

 rspensions. III. Ag- 

 01 proteins, normal 



d BELLOWS, MAR- 

 of bacteria by pro- 



PARKER, G. H. Th< 



Fur- 

 calibration of the Osterhout 



CROZIER, W. J. Cell penetration by acids. V. Note 

 on the estimation of permeability changes. 



HITCHCOCK, DAVID I. The combination of gelatin 

 with hydrochloric acid. 



LOEB, J.^CQUES. The mechanism by which trival- 

 ent and tetravalent ions produce an electrical 

 charge on isoelectric protein. 



LOEB, JACQUES. Ionizing influence of salts with 

 trivalent and tetravalent ions on crystalline egg 

 albumin at the isoelectric point. 



LOEB, J.\CQUES. On the influence of aggregates 

 on the membrane potentials and the osmotic pres- 

 sure of protein solutions. 



INDEX TO VOLUME IV. 



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 Published biirtonthly by 



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