1899] MICROSCOPICAL JOURNAL. 199 



ates and Flowering- Plants.' 



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

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

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



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

 genesis, Development of Embryo Sac, and Fecundation in 

 Gymnosperms' ; C. O. Townsend, 'Physiology of the 

 Plant Cell.' 



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

 'Plant Irritabillity'; G. F. Atkinson, 'Higher Fungi.' 



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

 morphology of a Few Angiospermic Orders' ; Henry 

 Kraemer, 'The Unorganized Contentsof Cells of Plants.' 



Sixth Week, August 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 greater 

 or less regularity. Bacteriological 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 Alter- 

 ation, gas-producing and acid-generating bacteria were fre- 

 quently found. Among some of the species isolated may 

 be mentioned the bacillus proteus vulgaris and the bacillus 

 coli communis. These bacteriological examinations show 

 clearly that however excellent the style of filters may be 

 for removing the coarser organic and inorganic 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 vegetable life and are 

 gcnerically known as bacteria. 



