. Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ... -- . gulation be brought about by a much weaker coagulantsuch as a weak solution of calcium chloride, or if the latex be froma preserved stock, the streaming is much slower and instead ofthe globules banking themselves up in continuous strands they i V. Henri, loc. cit. 1907 p. 1066 refers to the globules coming to rest instraight lines. This we also find to take place but particularly where a largeexcess of coagulant has been employed. IX] Congress of Applied Chemistry 27 form isolated
. Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ... -- . gulation be brought about by a much weaker coagulantsuch as a weak solution of calcium chloride, or if the latex be froma preserved stock, the streaming is much slower and instead ofthe globules banking themselves up in continuous strands they i V. Henri, loc. cit. 1907 p. 1066 refers to the globules coming to rest instraight lines. This we also find to take place but particularly where a largeexcess of coagulant has been employed. IX] Congress of Applied Chemistry 27 form isolated aggregates of varying size from perhaps a dozenglobules up to aggregates with several hundreds (Figs. 6, 7 & 8).These represent successive stages of agglutination or incompletecoagulation. In the first stage, Fig. 6, the larger aggregatescan be seen to be composed of globules arranged in layers givingrounded masses. In this case the agglutination or formationof aggregates is proceeding extremely slowly, many of the iso-lated globules are still in Brownian movement and are also inslow translatory Fig. In a later stage, Fig. 7, the aggregates have increased in sizeand all free globules have lost Brownian movement and prac-tically all translatory movement. Fig. 8, illustrates the finalstage of agglutination or stage attained more rapidly by theaddition of a coagulant in larger proportion than that requiredto produce the stage illustrated in Figs. 6 & 7. There are nofree globules and no movement of any description and the condi-tion is the same as that shown in Figs. 4 & 5, except that theaggregates are not joined up in strings forming a network butare in isolated groups of irregular size and shape, correspondingwith a turbid liquor containing flocculent masses which rapidlyrise to the surface and cream, leaving a more or less turbidserum below. The process can be watched and details noted. 28 Original Communications: Eighth International [vol. The streaming of the globule
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