theories in the field certainty convinces one of the extreme 

 value ot associating the sciences together especially where 

 they are so closely related as Physiography and Ecology. 

 When a small knowledge of one is once gained it is next to 

 impossible to rely alone upon the other. Dr H. C. Cowles of 

 the University of Chicago, made a visit with the writer to the 

 localities mentioned and it was apparent that the formations 

 and deposits were due entirely to lacustrine action and that 

 the further evidence necessary to establish the fact that the 

 ancient lake stood at these altitudes and was instrumental in 

 the creation of the evidence cited, was, after demonstrating 

 the existence of a 10 and 20 foot contour line around the lake, 

 to locate if possible, a dam or the remnant of one at the out- 

 let. 



The contour lines of 10 20, and 30 feet are not altogether 

 continuous in the vicinity of the lake especially on the nor- 

 thern shore. While the surface rises to higher altitudes east 

 of the lake, on the south and west the surface is so effectually 

 broken up by embayments that it is with difficulty that the 

 contour can be traced. Those east and south ot the lake are, 

 however, fairly continuous. The 10 foot line is followed with 

 but little difficulty but the 20 foot line takes in such a vastly 

 greater area that it is necessary to make constant reference to 

 the level and aneroid to establish it. There is no doubt that 

 the 3o foot line would include not only most of the city of 

 Warsaw, but even Centre aud Pike lakes. On the west the 

 high grounds close in rapidly upon the lake and since 

 this side is free from tributaries, there are practically no em- 

 bayments. Of course at the outlet there is a depression lead- 

 ing toward the Tippecanoe River. This depression as far 

 westward as the letter B on map I, was filled with water when 

 this lake was at its maximum height. Thisembayment varies 

 greatly in width and is about one and a half mile long. For 

 most of the distance the 10 foot contour line runs close to the 

 channel, the 20 foot line setting back considerably. All of the 

 contours converge at B which was found to be the location of 

 the greater dam. At A five eights of a mile east and where 

 the 10 foot lines are seen to converge, was found the location 

 of the lesser dam. These two dams contained the ancient lake 

 waters. 



16 



