106 



Drainaye. — Drainage is also responsible in a great measure for the 

 lower water level. The miles of tile and open clitclies, city storm sewers, 

 etc., carry a great part of the water to the streams as soon as it falls. 

 The water is thus carried away instead of being held to feed the wells, 

 springs, etc. Two instances have been given me in which wells went dry 

 after sloughs, lower than but near the well, had been drained. 



Greater Aiiiouuts Used. — A growing population has increased the 

 drain upon the (uidergvouiid water sup[>ly. Water is put to more uses than 

 formerly and this, no doubt, has its effect upon the water level. 



RELATIVE nI^()UTA^X'E OF ABOVE FACTORS. 



It was liojK'd that it would be possible to sejiarate the effects of de- 

 forestation and drainage and deterndne just the iiart each had played, 

 but this can not be done in .Abmtgomery County. My own judgment, based 

 on field work and reported data, is that drainage has i)Iayed as great a 

 part ill the loweiing of tlie water h'vel as has deforestation. 



The results of tliis study are not as definite as were at first expected, 

 lait it is bi'lieved that the rather tlKU-ougli study of such a typical county 

 in Indiana is well worth recording, and if is hojied that it may induce 

 others to nndei-take simihir surveys in various ]iarts of the State until 

 more definite data ai-e discovere*! upon which to base conclusions that, as 

 far as Indiana is concerned, will be sufficiently reliable for real scientific 

 work on the problem which depends upon these things. 



This investigation was carried on in the Botanical Laboratory of Wa- 

 bash College under the direetiou of Prof. M. B. Thomas. 



RIBLIOGRAPHy. 



The following bibliography, while not complet(\ is sufficiently compre- 

 hensive to cover fairly the ])oiMts presented. 



(1) Abbe, Cleveland. Deteruiinatioii of the True Amount of Precipita- 

 tion and its bearing on theories of forest Influences. Forest Service, 

 U. S. Dei)t. of Ag., Bull. No. 7, pp. 170-186. 



(2) Barbour, Erwin llinckly. Wells and Windmills in Nebraska. U. S. 

 Geo. Sur., Dept. of Int. W.-S. and Irr. Paper No. 29. 



(S) Blanford. Nature XXXIX, p. 5583. 



(4) Buffault. La capacite retentionelle de la foret. Revue des eaux et 

 forets. January, 1000, pp. 1-18, 33-34. April, 1900, pp. 229-234. Re- 

 viewed in American Forestry, March, 1910, jip. 15(1-173, and Forestry 

 Quarterly, Vol. 7, pp. 322-324, September, 1909. 



