252 RESEARCH SEMINAR. 



July 22, Dr. James J. Wolfe : " Cytolo'gical Studies on Ne- 

 malion." 



July 27, Dr. Henry Kraemer : "The Origin and Nature of 

 Color in ^Plants." 



August i, Dr. G. F. Blakeslee : "Sexual Reproduction of 

 the Mucorineae." 



August 10, Dr. Bradley M. Davis: "The Algal Flora of the 

 Bay of Naples." 



July 12. Botanical Work in Several Botanical Laboratories of 

 Holland, Scandinavia and Russia. By DR. GEORGE T. 

 MOORE. 



A popular account of a recent visit made to some of the prin- 

 ciple botanical laboratories in the countries mentioned. A de- 

 scription of the facilities for work at Delft, Amsterdam, Copen- 

 hagen, Christiania, Bergen and Stockholm, with a brief reference 

 to the principle botanists in these cities was given, as well as a 

 more detailed account of the Institute for Experimental Medicine 

 at St. Petersburgh and its illustrious director, Winogradsky. 



July 13. The Physiological Method of Purifying Water Res- 

 ervoirs. By DR. GEORGE T. MOORE. 



After a brief reference to the very widespread difficulty in 

 water supplies due to algae, and the failure to devise any means 

 of removing or preventing the bad odors and tastes, an account 

 of the toxic effect of copper sulfate upon algae was given. It 

 has been known for a long time that many of the heavy metals 

 were extremely poisonous to some plants, and experiments 

 showed that copper sulfate could be used at a dilution so high 

 as to be absolutely harmless to man and yet sufficient to destroy 

 or prevent the growth of algal pests. Practical application of 

 the method to reservoirs containing millions of gallons has shown 

 that the necessary requirements of efficiency, cheapness and 

 harmlessness to man are all complied with and it is believed that 

 a thoroughly reliable means has been devised for preventing the 

 growth of algae in water supplies. 



While the application of the method to the destruction of 

 typhoid and cholera is not universal as with the algae, it is be- 

 lieved that under certain conditions the use of copper sulphate 



