Xo. 608] SHORTER ARTICLES AXD DISCUSSIOX 495 



effect, if any, on Arfemia. The brine varied in density in the 

 lake at Saltair durnip- tlie years of tliese observations, according 

 to reason cuid rainfall, and bcMdes the annual thu-tuations gradu- 

 ally became W .ImM on a.v.mni of a cycli.-al lod of heavier 

 precipitation and c-oMs«'()Ufiil rise in level ot. tlie lake. In Oc- 

 tober, 1909, the (IciiMtN ^^as 1 1.-)^ and in Apnl 1915, im 



was feasible to the follmMn'. (m ii^.n. ^ 11-' 110 10- 1 Oh. 1 04. 

 1.02, 1.01* These dilntiun. uc p .i. . i m i . luai uiin lais. 



in mind, it was not hoped to repeat them with the small amounts 

 of water used. However, some data ol)tained. tliongh incom- 

 plete, seems worth recording, since the present writer can 

 scarcely hope ever to have further opportunity for pursuing 

 this line of investigation to the extent it deserves. It is sin- 

 cerely hoped that some one may be able to further investigate 

 the fauna normal to the unusual ecological conditions of brine 



Resistance of the adult Arlcmias to sudden changes in tlie con- 

 centration of the salts, while greater tlian anticipated, only 

 showed that they could not nuh-finiirly survive too ereat a 

 change. Plunged into lap waicr. a|i|..'aiv(l ■■|iriiv\. smk- 



