436 



DESCRIPTIVE GEOLOGY. 



arc, moreover, covered in places, for a Avidth of several inches, Avitli tlie 



larvae and pupce of insects which live in its waters, among which have been 



described 



Epliydra gracilis^ Packard. 



For the comparison of this great interior salt lake with those known in 

 other parts of the world, the following table has been prepared, giving the 

 analyses of the waters of some, whose physical conditions present points of 

 resemblance with this, together with the composition of the water of the 

 ocean, derived from a mean of nine analj^ses made of water taken from the 

 Northern Atlantic and German Oceans, and one of the Mediterranean Sea: 





I. 



11. 



III. 



IV. 



V. 



VI. 





M 



i 



S " 

 Ph 

 

 u 







<u a 

 c/) --s 



Q 



Atlantic Ocean, 

 mean of 9 an- 

 alyses.* 



c 

 u 





II. 8628 

 1. 4908 



6.23 

 1.03 



19.05 

 0.52 



12. no 

 7.822 

 I. 217 

 2.455 

 0.056 



2. 6730 

 0. 3229 

 0. 1290 



2. 9460 

 0. 3223 

 0. 0505 





Dotassium ................>...... 































0. 0417 



0. 0558 



magnesium ...... ....... ................ 









0.251 



Sulnhate of soda .................................. 



0. 9J2I 



0. 5363 

 0. 0S58 



1.34 





















0. 04 



0.18 

 0.80 



0.068 



0. 1629 

 o- 1975 



0. 1357 

 0. 2480 

 0. 01 13 



Fe203=o.ooo4 



96. 2300 



magnesia ... 



Carbonate of lime 









Other ingredients... ... ....... 



Cl.=o. 0862 

 85. 0060 







0.077 

 75- 944 





Water 



91.36 



79 45 



96. 4730 





100. 0000 



100.00 



100.00 



100.000 



100.0000 



loa 0000 



Of these, the Sevier Lake lies in the Utah Basin, to the southward, within 

 the limits of the ancient Lake Bonneville, being fed by a single river, the 

 Sevier, which reaches it after a comparatively long course through a desert 

 region. Its superficial area is only about a tenth of that of Salt Lake. 



The Oroomiah Sea of Northwestern Persia presents some remarkable 



1 Wheeler, Expl. W. of lOOth Merid., iii, 1875, 114. 

 =^Bischofif, Chem. Geol., ii, 1864, 59. 

 3 Bischoff, Chem. Geol., i, 1863, 313. 

 * BischoflP, Chem. Geol., ii, 1864, 33. 

 ^ Ramsay, Nature, vii, 313. 



