Report of the President 91 



ever, in securing the services of Dr. B. E. Dahlgren, who is 

 now at work on a new model of this insect. 



The water supply and sewage disposal section of the Public 

 Health exhibit has been extended and kept up-to-date through 

 the preparation by Mr. Otto Block of models of the Albany 

 water filter, of a modern chlorin disinfecting plant, of several 

 of the newer devices for sewage treatment, and through the 

 addition of charts illustrating the pollution of New York Har- 

 bor and the plans which have been made for its purification. 



The entire Hall of Public Health has been rearranged, under 

 the immediate direction of Mr. Coleman, so as to make its 

 sequence more logical and its general appearance more attrac- 

 tive. 



In connection with the Convocation Week meetings of the 

 American Association for the Advancement of Science, in 

 December, a special exhibit was prepared illustrating the life 

 and work of Louis Pasteur. 



The next section of the Hall of Public Health which it is 

 planned to work out is that dealing with Food. A comprehen- 

 sive outline has been prepared to cover the food needs of man- 

 kind, the nature and sources of our food supply, the food 

 habits of primitive peoples, the improvement of food products 

 by the application of biological science, the transportation and 

 handling of foods, the relationship of food to disease and the 

 economic and hygienic aspects of the dietary. Work has 

 already been begun by Dr. Hull on the preparation of a series 

 of charts illustrating the world movements of food products, 

 and models of various typical foods illustrating their calorific 

 value are in process of construction. 



The Museum of Living Bacteria has had an unusually suc- 

 cessful year and continues to fill a unique place in the service 

 of pure and applied bacteriology. Seventy-two 



Muse^m 10 ^ 031 new strains have been added, making the total 

 number now under cultivation 716. During the 

 year ending December 1, 1916, 3,929 cultures were sent with- 

 out charge to laboratories of universities and health depart- 

 ments, making a total of 15,145 cultures distributed since the 

 opening of the laboratory in 191 1. Eighty-four new institu- 



