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secretary. The names of the following persons who had qualified 

 as sustaining members of the Club were then read by the 

 secretary: Dr. J. H. Barnhart, Hon. Addison Brown, James B. 

 Ford, John Kane and Gustave Ramsperger. Miss Caroline C. 

 Haynes and Mr. H. A. Cassebeer, Jr., have accepted the invita- 

 tion to become sustaining members. 



On motion of Dr. Britton the secretary was instructed to 

 ascertain what action was taken by the Club in fixing the day 

 of the Wednesday meeting and to report at the next meeting 

 the method by which the day of a regular meeting may be 

 changed. 



The scientific program consisted of a paper on "Rubber-pro- 

 ducing Plants" by Mr. B. T. Butler. The following abstract 

 was furnished by the speaker: 



"The rubber-producing plants of the world are confined largely 

 to the following families: Euphorbiaceae, Apocynaceae, and 

 Moraceae. The Asclepiadaceae, although very milky plants, 

 has few species that yield caoutchouc. The Compositae has 

 one genus, Parthenium, that yields the Guayule rubber of 

 Mexico. 



"The Euphorbiaceae is the most important family from a 

 commerical standpoint as it includes the genus Hevea which 

 produces the highest grade rubber — Para. Hevea hrasiliensis 

 Muell. is the best known of this genus. Pure Para rubber brings 

 the highest market price. This species is largely cultivated in 

 all tropical countries, supplanting the well-known Ficus elastica 

 in the Far East. 



"The genus Sapium is a near realtive of the Hevea and produces 

 the White Rubber of the northern South American countries. 

 Sapium aucuparium Jacq. does not "bleed" freely and the 

 caoutchouc dries or coagulates naturally beneath the bark. This 

 can be extracted by mechanical means. 



"The family Moraceae includes the Ramboug, Ficus elastica 

 Roxb., which produces a low grade rubber. The Castilla of 

 Central America and Mexico, which yields a fine product is much 

 cultivated. 

 , "The Apocynaceae contains the lianes or tropical climbers. 



