Record. xxi 



fined to the immediate vicinity of the thrust. The media in 

 both cases are made up without peptone. The formulae 

 are: — 



For plate cultures : For tube cultures : 



Agar 10 grams. Agar 5 grams. 



Gelatine 25 " Gelatine 80 «< 



Beef extract 5 '« Beef extract 5 " 



Glucose 10 " Glucose 10 " 



Salt 5 « Salt 5 « 



Normal acid 20 cc. Normal acid 15 cc. 



The whole increased to 1000 cc. The whole increased to 1000 cc. 



The growth of the two species in question, on potato and in 

 milk cultures with litmus, was also demonstrated. 



The following persons, resident in St. Louis, were elected 

 active members: David C. Ball, Dr. E. C. Burnett, Ferd- 

 inand Diehm, Franklin Ferriss, Dr. L. C. McElwee, Chas. H. 

 Stone, W. S. Vickroy, L. J. W. Wall. 



Four persons were proposed for active membership. 



March 21, 1898. 



President Engler in the chair, fifteen persons present. 



Professor J. B. Johnson spoke informally on some aspects 

 of the manufacture and testing of Portland cement, reviewing 

 the historical development of the cement industry from the 

 time of Smeaton, and showing that the first true Portland 

 cement had been made and patented in Yorkshire, England, 

 in 1825, though it was not until about 1850 that it was known 

 in Loudon ; and that its manufacture in Germany began at 

 Stettin, in 1853, while it was not until 1875 that it was made 

 in the United States. The statement was made that the 

 increase in the use of this material now outruns the rapidly 

 increasing production. The various methods of manufacture 

 were outlined, and the theory was explained on which the 

 various processes are based. The accepted theory of the 

 hardening ingredients was given, and some of the standard 

 methods of testing were described. Two improvements that 

 the speaker hoped to see introduced in the standard methods 

 of testing were considered in detail, — one, a modification of 



