LITERATURE 9 



Cma ClNa OlNa ClNa 



Fig. 32. — A drop of sea water joined by a canal with a drop of distilled water. Tt 

 density of the sea water is being gradually increased in the successive figures b 

 the dissolution of grains of salt placed at one edge. As the solution thickens, tli 

 organisms (marine Anophrys, represented by dots) retreat towards the distille 

 water. {From Massart, '91.) 



such that they are repelled by either hyperisotonic or hypisc 

 tonic solutions; only in a certain concentration do they com 

 to rest. We may speak of these organisms as attuned t 

 this concentration. Different organisms are attuned to dii 

 ferent concentrations, and there can be no doubt that th 

 degree of concentration to which they are attuned is detei 

 mined by the past experience of the organisms, as the fact 

 of acclimatization indicate. 



LITERATURE 



Beet, P. '66. Note sur la mort des poissons de mer dans I'eau douc 



Mem. Soc. Sci. phys. at nat. Bordeaux. IV, 47-49. 

 '71. Sur les phenomenes at las causes da la mort das animaux d'ea 



douce que Ton plonga dans I'eau de mer. Comp. Rand. LXXII 



382-385; 464-467. Aug. 1871. 

 '73. La mort des animaux d'eau douce que I'on immerge dans I'aau c 



mer. C. R. Soc. da Biol., Paris. XXIII, 59-61. 

 '83. Sur la cause de la mort das animaux d'eau douca qu'on plonga dai 



I'eau de mar at r^ciproquemant. Comp. Rand. XCVII, 133-13( 



16 July, 1883. 

 Beudant, F. S. '16. Memoire sur la possibilite de faire vivre des Mc 



lusquas fluviatiles dans las eaux salines, etc. Jour, de Phys. LXXXII 



268-284. 1816. 

 Butschli, O. '92. Untersuchungen iiber mikroskopische Schaume und di 



Protoplasma. Leipzig. 232 pp. 1892. 



