(40 



THE MULBERRY FAMILY (Moraceae) 



t 



914. Cordoban. — The stems of Pedilanthus Pringlei Robinson. NatuS of Mexico. 



It yields a small quantity of rubber. Collected by H. H. Rusby at Cuicatlan, 

 Oaxaca, Mexico, July, 1910. 



915. Palo Amarillo. — The fruiting branches of Euphorbiodendron fulvum (Rose & 



Alt.) Millsp. Native of Mexico. The tree yields a small quantity of 

 rubber. Collected by H. H. Rusby at Empalma de Gonzales, Mexico, 

 June, 1910. 

 916-923. The Central American rubber tree, Castilla elastica Cerv. Native of 

 Central America and largely cultivated as a source of rubber. The milk 

 of this tree is collected and treated very much in the same way as that of 

 the Hevea. These samples were presented by the India Rubber World. 



916. Rubber coagulated by water only. 



917. Rubber coagulated by the juice of the "Amole" (probably a species of Yucca, 



of the lily family). 



918. Central American rubber. — Made, in 1903, in the Botanical Garden of 



Dominica, West Indies, from cultivated trees eight years old. 



919. 18 Central American Rubber, produced in the Royal Botanic Garden, Trinidad, 

 West Indies. 



920. The same, from the Mezarni River, British Guiana. 



921. Mesquit rubber. The same from Mexico. Presented by R. L. Johnston. 



922. Hule or Ule Tuna rubber. — Made from Castilla Tuna Hemsley. Native of 



Central America. From Nicaragua. 



923. Concho rubber. — Made from a species of Castilla, native of South America. 



From the Amazon valley. 



924. Assam rubber. — Made from Ficus elastica Roxb., the original source of India 



rubber. From trees cultivated at Selangor, Ceylon. 



925. A Rubber of unknown botanical origin. From Bolivia. Presented by A. 



Metzner, of New York City. 



THE DOGBANE FAMILY (Apocynaceae) 



926. 19 Leafy branch of Landolphia Thollonii Dewevre. 



927. Branches of the same. 



928. Rubber made from the preceding plant. 



929. Picture of leafy branch of Landolphia humilis Schlecht. 



930. Stems of the same. 



931. Stem of L. owariensis Beauv. 



932. Leaves of the same. 



933. Soudan twist rubber. — Made from a species of Landolphia from French 



Soudan, Africa. 



934. Red Kasai rubber. — Made from an African species of Landolphia. From the 



Kasai River, Congo. 



935. Black Kasai rubber. — From another species of Landolphia, of the same region. 



18 Numbers 919 and 920 were presented by the India Rubber World. 



19 Numbers 926-935, representing the genus Landolphia, of tropical Africa, 

 were presented by J. H. Heinicke, of New York City. 



