66 



ment is indicated. When no authority is given the author is responsible 

 for the data. 



The following is a list of observers most quoted. Their initials are 

 used to indicate their authority. 



V. H. Barnett. 



W. S. Blatchley. 



C. H. Bollman. 



C. H. Eigenniann. 



B. W. E'vermann. 

 W. L. Halm. 



P. J. Hartman. 



C. H. Kennedy. 

 E. M. Kindle. 

 C. G. Littell. 

 W. L. McAtee. 

 N. B. Myers. 



A. B. Ulrey. 



G. G. Williamson. 



When other authorities are quoted their names are given in full. 



To make the facts contained in this paper more readily accessible to 

 teachers and students they have been placed in tabular form and ap- 

 pear at the end of the paper. The table and the index were prepared by 

 C. H. Frazea and Leonard Haseman. 



The region over which observations have been made, embracing the 

 territory within about live miles of Bloomiiigtou, is varied in its topogra- 

 phy. On the east and north are many rocky ravines, some of th; :a con'a'n- 

 ing cascades. At Bloomingion, to the south of ii and some distance t'j tlu 

 west the surface is gently rolling anil lias typical features of the oolitic 

 limestone area of Indiana. To the west in the Mitchell limestone area 

 the surface is pitted with various sinkholes beneath which are caves of 

 considerable extent. Blcomii-2;lo:i and the aiea about it are well drained 

 by rock bound brooks running in part to the north through Rocky Branch, 

 Griffy Creek and Bean Blossom, finally flowing into the North Fork of 

 White River. Other brooks, the Jordan River and Clear Creek drain the 

 southern part of Bloomington through Clear Creek into the East Fork of 

 White River. The extreme eastern part of the area is drained into Salt 

 Creek and thence into the East Fork of White River. The western part 



