65 



The colouy-building iufusorial form InxjleHU has appeared iu the water 

 of the LaFayette reservoir rather regularly in the summer months since 

 1896, and has been the cause of much annoyance to the water works offi- 

 cials. . At such times it has imparted a very disagi-eeable odor and taste 

 to the water, leading- many consumers to complain that there were dead 

 fish or eels in the pipes. In the summer of 1898 it became necessary to- 

 have the water completely drawn off from the reservoir In order to thor- 

 oughly cleanse it and get rid of the Uroglena. Thei-e has been no serious 

 trouble since that time. 



The star-shaped diatom Asterionella, although occurring in considerable 

 numbers, has not. as far as kuo^\ni. caused any noticeable effect on the 

 odor or taste of the water. Yet this is the organism which has so often 

 given the characteristic geranium taste to many eastern water supplies. 



Another infusorial form. Dinohrijou. is present in the water of the 

 reservoir in large numbers at the present time. Should this number in- 

 crease to any great extent, we may expect to have a fishy odor and 

 ta.ste imparted to the water. 



Aside from these three above mentioned forms, the organisms found in 

 the reservoir have practically no effect on the odor or taste of the water. 



Physical Observations of the 1*lanet Mars at the 

 Opposition of 1901. 



W. A. COGSHALL. 



Observations of tlie last opposition of ]Mars were made at the Kirk- 

 wood Observatory of Indiana I'niversity from the time the twelve-inch, 

 telescope was in place, early in February, till late in May. The observa- 

 tions consisted mainly in drawing tlie surface markings and were car- 

 ried on nearly every good night between the dates mentioned. The draw- 

 ings submitted herewitli were all made between Fel)ruary lo and May 1. 

 Drawings of two dift'erent ol)servers are included in the series, part being 

 by Professor .J. A. Miller, and part liy tlie writer. Where the drawings 

 of both for the same night are placed together tliey are generally marked 

 by the proper initials. In all this work tlie drawing was done as inde- 

 pendently as possible, neitlier looking at tlie other's drawing until both 

 were complete. It will be seen that in every case the marlcings drawn 

 are essentially the same, although the draAvings vary slightly both in 

 detail and in the location of the dark areas. Dr. :Miller almost always plac- 

 ing the dark regions of the soutliern liemisphere somewhat fartlier to 

 the south than did the writer. 



