32 



No. :!. Castilloa. 

 " 350 c. c. Oastilloa latex from trees 4^ years old. Added 150 c. c. 

 alcohol. After coagulation and draining the rubber blackened 

 quickly. Obtained 14o grams of wet rubber." 



The specimen consisted of a single piece about 4 inches by 2 

 inches by 1 inch weighing 95 grams, and was evidently of very 

 inferior quality. The mass was very hard but could be indented with 

 the finger nail and its shape alter by compression : it was almost black 

 externally but dark brown within and small fragments of bark were 

 distributed through it. Small pieces of the material were soft and 

 exhibited only slight elasticity and very little tenacity. 



No. 4. Castilloa. 



•' 350 C. e. of Castilloa latex from Trees 4^ years old. Added two 

 litres of water and set to cream for 12 hours. Coagulated with alcohol 

 and obtained 118 grams of wet rubber. This appears brittle. 

 (reamed rubber is always cleaner and whiter than rubber from latex 

 coagulated as gathered. It appears to wash away much proteid 

 matter." 



This was very similar to the preceding sample, No. •'!. in appear- 

 ance and characters but was a little softer and more elastic. It was a 

 single piece about 5 inches by 2 inches by 1 inch weighing 85 grams, 

 which was dark brown externally but much lighter within, the freshly 

 cut surface having a glossy appearance. 



No. 5. — FUNTUMIA. 



" 50 c. c. of latex of Funtiimia elastica from trees 4J> years old. 

 Coagulated with heat over lamp. Obtained 42*8 grams of rubber."' 



The specimen was a small ball oi rubber weighing oil grams. It 

 was of a light brown colour externally but darkened on keeping; 

 within it was quite white, porous, and contained a considerable 

 quantity of uncoagulated latex. The ball was therefore cut into 

 slices and allowed to dry in the air before analysis. The rubber 

 exhibited satisfactory physical character : it was rather soft but very 

 elastic and tenacious and only slightly sticky. 



No. 7. — Castilloa. 



"" 500 C.C. Castilloa latex from trees 4^ years old. Poured direct 

 on copper mesh (tine wire' and allowed to drain. Rubber coagulated 

 by air naturally in 48 hours. Was taken off wire and doubled up." 



'flic specimen consisted of a sheet of black rubber, about 12 inches 

 square and } inch thick, which was slightly mouldy on the surface. 

 It was of very inferior quality, being only slightly elastic and exhib- 

 iting very little tenacity. 



No. '.'. — Castilloa. 



'• 600 r.t-. of Castilloa latex from trees over 12 years old. Added 



alcohol to coagulate Coagulation appeared imperfect. To be com- 

 pared with No. 3, old and young." 



This specimen consisted of a single piece of black rubber weighing 

 200 grants. When cut open it was found to be very porous and con- 

 tained a considerable quantity of acid liquid: it was therefore cut into 

 slices and air-dried before analysis. It also contained numerous trap- 



