Contents. vii 
Correspondence. 
When was the Mississippi river valley formed? P. J. Farns- 
zi'ortli 393 
Recent decline in lake Nicaragua. B. Shiinek 395 
Personal and Scientific News. 
Geological Society of Washington, 398; Lehigh Universiry, 
398; J. W. Spencer, Excursion of Teachers, 399; Geological 
Explorations near Athens, 399. 
Index 401 
Errata vii 
Erratum for Volume XXVII. 
Page 388, line 6, for Java read Jena. 
Errata for Volume XXVIII. 
Page 119, line 6 from the bottom, erase the words: "by the means 
shown in plate V." 
Page 281, line 8 from the bottom, from "reproduced" read represented. 
