14 
The latex was taken pud ui the trees, strained through 
wire gauze to remove any pieces of bark, and then, if very thick, 
diluted > about the OAY of thin cream. The first experi- 
ere made with the latex of Castilloa elastica. After 
ceci fagi ng for from three to four minutes, ihe. rubber- 
particles completely separated as a thick, creamy, white layer, 
rom the deep bro i 
an excess of water to thoroughly wash it, and again separated. 
The separated particles were then shaken with water, so as to 
form an emulsion, and alkalies were added. No coagulation now 
occurred, even ipeo the mixture e. qaem to stand for 
several days. The particles could, how , be brought into a 
solid mass by pressure, by gentle hosting, oi by drying off the 
water with a porous tile. 
So pr epared, the rubber formed a pure white mass, without any 
trace of its usually characteristie smell. On exposure to the air 
for several days, the surface became brown, probably owing to 
oxidation 
The pe satin’ of rubber in the latex was estimated at son ae 
time by wis ting = * C. The weight of the dry substan 
2:5 grammes, which, as the specific gravity s Sa astien 
latex is rain ly " » gives a yield of 25 per e 
On treating the latex of Hevea brasiliensis in the same way for 
a slightly longer time, a similar separation occurred. The same 
mployed i 
form a solid mass, while the addition of acetic sige and the action 
of the smoke of barning urucuri nuts had no e 
The yield ern estimated as before, was bin 28 to 30 per 
cent. "The latex of Manihot Glaziovii also separated readily and 
gave results Seely parallel with those mentioned above. This 
latex is interesting, as it is readily clotted by churning. A soft 
spongy clot is formed in a few minutes containing in its meshes 
the greater part of the solution in which the rubber-particles were 
suspended. If this clot is cut e slices NN liat oft and 
pressed between sugar-cane crus or in a heavy press, the 
tm of 2 ruinam is extracted pes a o pilis rubber is 
ng, it does not zc e usd the Sand smell 
iaaiiai of ie ordinary Ceara “ 
Other Te can also be clotted. weg dann but the process is 
a long on 
The la ur of Hancornia speciosa and of gett ge dps gave 
similar results on centrifugalizing. In the f the latter, the 
pink colouring-matter which characterizes "balata * Was Tani to 
have s separated as a thin layer at the bottom of the tubes 
Artocarpus enge contains a very viscous latex cA, by 
the Brazilians as a bird-lime or as a substitute for glue. When 
diluted and cenbrifagaliaed it m CI giving a creamy 
white layer which dries to à resinous mass somewhat resembling 
-percha. At the ordinary Marna ture this i is quite hard and 
gutta 
brittle, but if the temperature is raised slightly it becomes plastic, - 
