1899] MICROSCOPICAL JOURNAL. 199 



ates and Flowering- Plants.' 



Second Week, July 12-19.— Miss Clara E. Cumming-s, 

 'Lichens' ; L. M. Underwood, 'The Evolution of the 

 Hepaticae' ; Rodney H. True, 'Plants and Poisons.' 



Third Week, July 19-26.— H. J. Webber, 'Spermato- 

 g-enesis. Development of Embryo Sac, and Fecundation in 

 Gymnosperms' ; C. O. Townsend, 'Physiolog"y of the 

 Plant Cell.' 



Fourth Week, July 26 August 2. J. M. Macfarlane, 

 'Plant Irritabillity'; G. F. Atkinson, 'Hig-her Fung-i.' 



Fifth Week, Aug-ust 2-9.— J. M. Macfarlane, 'Physio- 

 morphology of a Few Angiospermic Orders' ; Henry 

 Kraemer, 'The Unorganized Contentsof Cells of Plants.' 



Sixth Week, Aug^ust 9-16.— D. M. Mottier, 'Cytological 

 Studies on the Pollen and Embryo-sac of Angiosperms' ; 

 D. P. Penhallow, 'Paleobotany.' 



BACTERIOLOGY. 



Systematic Examination of Water Supply. — During- the 

 years 1897 and 1898, cultural examinations of the water 

 supplied to the Denver city mains were made with g-reater 

 or less reg-ularity. Bacteriolog-ical examinations were also 

 made of several supplies at their sources, but it was im- 

 possible to test any one of these supplies individually, as 

 they were delivered to the consumer, since the water sup- 

 plied by the Denver Union Water Company constitutes a 

 mixed supply. In the examinations made at the Marston 

 Lake filter plant, in the water both before and after filter- 

 ation, g-as-producing-and acid-generating- bacteria were fre- 

 quently found. Among some of the species isolated may 

 be mentioned the bacillus proteus vulg-aris and the bacillus 

 coli communis. These bacteriological examinations show 

 clearly that however excellent the style of filters may be 

 for removing the coarser org-anic and inorg-anic impurities 

 of a water destined for domestic consumption, yet they 

 are absolutely not qualified to remove those microscopic 

 plants which are the lowest forms of veg-etable life and are 

 gcncrically known as bacteria. 



