242 RESEARCH SEMINAR. 



July 31. Mr. Herbert J. Webber: "The Utilization of Hy- 

 brids in Practical Plant Breeding and the Selection of Vegetative 

 Parts in Breeding." 



August 5, Dr. Bradley M. Davis : " Cytoplasmic Structures 

 of the Plant Cell." 



August 6, Dr. Rodney H. True : " Theory of the Nature of 

 Solutions. Dissociation Hypothesis and Objections to it." 



August 7, Dr. Rodney H. True : "Toxic Action of Solutions 

 on Plants, caused by Solutions Containing One Solute." 



August 10, Dr. Rodney H. True : "Toxic Action of Solu- 

 tions on Plants Caus'ed by Solutions containing more .than one 

 Solute." 



August n, Dr. Rodney H. True : "Influence of Solutions on 

 Plant Functions and Structure." 



August ii, Mr. Christopher S. Oglevee : "The Influence of 

 Insoluble Substances on the Action of Poisons in Solutions." 



August 12, Dr. Rodney H. True : " Artificial Sea Water." 



July 8. The Pollution of Public Water Supplies by Algae. 



By GEORGE T. MOORE. 



The importance of a scientific investigation of this most com- 

 mon cause of the bad odors and tastes in drinking water was 

 pointed out and numerous examples were given of the serious 

 inconvenience and great financial loss due to the presence of 

 algae in reservoirs. It is necessary to recognize that the means 

 of finding a remedy for the trouble must be biological rather than 

 chemical or mechanical, and it is only after we are familiar with 

 the life history of the organisms producing the odor and taste 

 that we can hope to find a remedy. 



Certain experiments then under way, being carried on by the 

 Department of Agriculture, were described, and it was believed 

 that the result of these trials would prove the discovery of a 

 cheap and practical remedy which could be used on the largest 

 scale and yet not cause trouble to the consumer. 



July 10. The Relationships of the Sexual Organs of Plants. 

 By BRADLEY MOORE DAVIS. 



The types of sexual organs found in plants, their structure, 

 origin and relationships were considered. These types fall into 



