EFFECTS UPON FISHES OF CHANGES IN SALINITY OF WATEK. 107 



taken in faintly saline water near the (Sacramento) river's mouth. Greene's conclu- 

 sion appears to be that the slight extent of this reduction was owing to the short time 

 which had elapsed since the fishes had left the sea. Unfortunatel^v the length of this 

 interval is not stated. According to Rutter's account, the first steps of the passage 

 into the Sacramento River are rather gradual, the fish falling back somewhat with 

 each ebb tide. My own experiments show that with certain fishes, at least, a single 

 day's sojourn in fresh water is suflicient to eflect a considerable reduction in the salt 

 content of the body. On the other hand, even a ver^- slight degree of salinitj' was 

 sufiicient to prevent this change. In the absence of further data I suggest the same 

 explanation for the results obtained by Greene with the brackish-water salmon. 



LIST OK WORKS REFERRED TO. 



1891. Atw.vter, W. O. The chemical composition and nutritive values of food fishes and aquatic 



invertebrates. Report of V. S. Commission of Fish and Fisheries for 1888, pp. 679-868. 

 1898. B.\LLAND. Sur la composition des poissons, des crustaces et des moUusques. Comptes rendus 



de rAcad(5mie des Sciences, t. 126, pp. 1728-1731. 

 1903. Bea-v, T. H. Catalogue of the fishes of New York. Bulletin no. 60, New York State Museum. 

 1865. Bernard, C. Introduction a I'etude de la medecine experimentale. Paris, 1865. 

 1871. Bert, P. Sur les ph^nomenes et les causes de la mort des animaux d'eau douce que Ton itlonge 



dans I'eau de mer. Comptes rendus de I'Academie des Sciences, t. 73, pp. 382-385, 464-467. 

 1873. . La mort des animaux d'eau douce que I'on immerge dans I'eau de mer. 



Cbmptes rendus de la Societe de Biologie, 5' sc'rie, t. 3, pp. 59-61. 

 1883. ■ — . Sur la cause le la mort des animaux d'eau douce qu'on plonge dans I'eau de 



mer et reciproquement. Comptes rendus de I'Academie des Sciences, t. 97, pp. 133-136. 



1896. BoTTAZzi, F., and Ducceschi. Resistance des erythrocytes, etc. Archives italiennesde Biologie, 



t. 26, pp. 161-172. 



1897. BoTTAZzi, F. La pression osmotique du sang des animaux marins. Archives italiennes de 



Biologie, t. 28, pp. 61-72. 



1901. BoTTAZzi, F., and Enriques, P. Ueber die Bedingungen des osmotischen Gleichgewichts und 

 des Gleichgewichtsmangels zwischen den organischen Flussigkeiten und dem iiusseren Medium 

 bei den Wasserthieren. Archiv fur Anatomie und Physiologie. Supplement-Band, p. 109- 

 170. 



1903. Brown, 0. II. The immunity of Fundulus eggs and embryos to electrical stimulation. Ameri- 

 can Journal ol Ptiysiology, vol. 9, pp. 111-115. 



1903. Church, A. H. Food. London, 1903. 



1897. Davenport, C. B. Experimental morphology. New York, 1897. 



1884. Dittmar, W. Report on researches into the composition of ocean water. Challenger Reports: 



Physics and Chemistry, vol, i. 



1885. Fredericq, L. Influerice du milieu ambiant sur la composition du sang des animaux aquatiques. 



Archives de Zoologie Experimentale, 2' serie, t. in. Notes et Revue, pp. x.xxiv-x.xxviii. 

 1891. . Sur la physiologie de la branchie. Archives de Zoologie Experimentale, 2' 



.serie, t. ix, pp. 117-123. 

 1904. . Sur la concentration moleculaire du sang et des tissus chez les animaux aqua- 

 tiques. Archives de Biologie, t. 20, pp. 709-730. 

 1895. (tarman, S. The cyprinodonts. Memoirs of the Museum of Comparative Zoology, vol. xix, 



1895. 

 1905. Garrey, W. E. The osmotic pressure of sea water and of the blood of marine animals. 



Biological Bulletin, vol. viii, no. 4, pp. 257-270. 

 1900. GiARi), A. Sur I'adaptation brusque de I'einnoche {G'istero.-<tt'iix li-nchunix Cuv. et Val.) aux 



eaux alternativement douces et marines. Comptes rendus de la Societe de Biologie, t. 52, 



pp. 46-48. 



