THE AFRICAN RUBBER VINES 



201 



dry rubber, including that which coagulated in the cuts, 

 was 172" 8 grams, i.e. a little over 6 oz., equal to rs 

 gram per incision. Other vines which were tapped gave 

 lower yields than this ; but the majority of them had 

 been very severely tapped dining the preceding season, 

 and were therefore not in good condition. 



Landolphia Gentilii. — This vine is very closely allied 

 to L. owariensis, and a tapping experiment conducted 

 at Bena Dibele by .M. Seret gave the following results, 

 which are very similar to those akeady recorded for 

 L. owariensis : 



Landolphia Klainei. — M. Seret obtained the following 

 results from a specimen of this vine at Bena Dibele : 



In this case, therefore, the bulk of the rubber was 

 obtained from the latex, the bark yielding less than one- 

 fifth of the total. 



Landolphia Kirkii. — It is stated that Landolphia 

 Kirkii vines in Nyasaland furnish on an average about 

 1 oz. of rubber per annum, the yield depending principally 

 on the age of the vine. As much as 7 oz. of rubber have 

 been obtained in a year from specially large vines. 



According to experiments made by Capt. SUveira 

 Machado in Portuguese East Africa, vines belonging to 

 this species give an average yield of about 28 grams at 

 one tapping during the dry season, and 120 grams during 

 the wet season. Experiments made by the Mozambique 

 Company indicate that the yield of rubber varies from 

 30 to 200 grams per vine. 



