25 



means of attvacting attention to the facilities Avliicli tlie Univer- 

 sity offers for instruction in the sciences, since students availing 

 themselves of the opportunities of the Summer School are apt 

 to be drawn to the University for further work. 



Although the number in attendance was not so large as had 

 been expected, still certain features of the enterprise are 

 encouraging. Among these is the cordial response of the 

 citizens of Havana to those needs of the School which can be 

 supplied only by local support. There was no difficulty in 

 securing pleasant and comfortable accommodations for all in 

 attendance ; and a much larger number would not have exhausted 

 the facilities offered. From its beginning the Station has 

 received generous treatment at the hands of the business men 

 of the town. Indeed, the granting of a site for a Station build- 

 ing upon the public river front on the bluff overlooking the river 

 has been urged in the local press. A second encouraging 

 feature is the satisfaction expressed by those in attendance 

 with the work they have been able to accomplish in Havana, 

 and the frequently repeated desire to continue it when oppor- 

 tunity offers. 



Very respectfully yours, 



C. A. KOFOID, 



Siijx'rnttendent of Biological Station. 



REPORT ON WATER ANALYSES. 



To the T)irvrtor of t lie Lahoratori/. 



Sir : During the two years just passed the number of 

 water samples, from the streams and lakes in the vicinity of 

 Havana, Illinois, which were examined by the State Water Sur- 

 vey as conducted by the department of Chemistry of the Uni- 

 versity, were as follows: Illinois Eiver and Spoon Paver 102 

 samples from each, these being regular weekly collections from 

 each of these sources. The collections from Quiver Lake immber, 

 all told, 'IS, and a like number has been taken from Thomp- 

 son's Lake. The waters from these different sources have been 

 subjected to the regular sanitary analysis and there has been in 

 the different seasons of the year considerable variation in the 

 quantities of organic matters contained, but it is to be noted that 



