1897J MICROSCOPICAL JOURNAL. 317 



sbalte benutzten pflanzlichen Rohstoff. Vol. I, pp. 548 

 614, Vienna und Leipzig. 



46. Tschirch A. und Oersterle. Anatoraischer Atlas der 

 Piiarmakoguosie und Nalirungsmittelkunde. Leipzig, 

 Hermann Tauclmitz, F. 0. Weigel. 



47. Uloth : Ueber Pflanzenschleime und seine Ent- 

 tehung in den Samenepidermis von Plantago maritima 



und Lepidium sativum, Flora 1875, pp. 193-409, PI. iv. 



48. Vogl : Nahrungs- und Genussmittel, p, 116, fig. 

 97. 



49. Wiesner, J. : Rolistoife des Pflanzenreiches, p. 721 

 Leipzig, Engelmann 1873, pp. 846. 



A Cause of Foul Water in Reservoirs. 



By ARTHUR M. EDWARDS, M. D., 

 NEWAKK, N. J. 



To tlie presence of a bacillarian, a diatom in fact, is 

 due a certain fouling of drinking water. Prof. Leeds, of 

 the Stevens Institute of Technology has given to it the 

 name of Asterionella flavor. In the report on the city 

 water of Brooklyn, N. Y. it is detailed. The results 

 arrived at are microscopically and technically of great 

 value. 



By order of the board constituting the department of 

 the city works, on September 4, 1896, the Engineer was 

 requested "to make such examination of the Brooklyn 

 water supply as he should deem necessary, in order to 

 determine the cause of the complaints made in regard to 

 its quality, and the remedy to be applied. 



Daily examinations showed that immediate action was 

 nec»^ssary. The objectionable appearance, taste and 

 odor during the mid-summer periods has been essentially 

 due to the protista, a plant growth known as Asterionella. 



