xxxvi Trans. Acad. Sci. of St. Louis. 



continuities in evolution of the trotting horse. If the pre- 

 diction were to be made now on the basis of what is now 

 known, no change would be made. The same diagram repre- 

 sents the performance of the running horse, by the lower 

 curve. His final speed will be about 6.5 seconds per mile 

 better than that of the trotting horse, or 1:31. 5 (91.5 

 seconds per mile). 



Since the above communication was made, the three last 

 records shown on the diagram have been ruled out. They 

 were made with a wind-shield in front of the horse. The 

 present record stands at 121.25 or 2:01^. 



March 7, 1904. 



Attendance, eighteen. 



President Edwin Harrison in the chair. 



Dr. C. A. Snodgrass, City Bacteriologist and Pathologist, 

 read a paper on the subject: "Bacteria and their Work," 

 illustrated with drawings and cultures. He gave a clear con- 

 ception of the place occupied by bacteria in the living world, 

 and the important work they do. He emphasized the fact, 

 that bacteria must not be confounded with disease. He dis- 

 cussed the distribution of bacteria, changes in bacterial flora 

 in milk supplies ; the bacteria of the Illinois, Missouri and 

 Mississippi rivers; symbiosis; immunity; biological factors, 

 that affect bacteria; the relation of human and bovine 

 tuberculosis; and various methods by which infection occurs. 



March 21, 1904. 



Attendance, eighteen. 



President Edwin Harrison in the chair. 



Professor Francis E. Nipher presented a paper on " Primi- 

 tive Conditions in the Solar Nebula," * as a continuation to 

 other papers presented previously. 



Prof. W. L. Eickenberry delivered a lecture on the 

 " Principles of Ecology and Development of Plant Societies." 



* Transactions, Vol. XIV., No. 4. 



