. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 136 PRODUCTS, ADVENTITIOUS. like matter of true gelatin-yielding growths, and of colloid cancer ; from both which it also completely differs in structural characters. Miiller figures under the title of Collonema a soft gelatiniform tumour of the brain (seen also in the breast), composed of grey-coloured cells, a few fibres and vessels, and acicular cystals, soluble in boiling aether. The re- actions of the growth in the brain most closely corresponded to those of ptyalin (?) ; that in the breast contained -a minute quant
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 136 PRODUCTS, ADVENTITIOUS. like matter of true gelatin-yielding growths, and of colloid cancer ; from both which it also completely differs in structural characters. Miiller figures under the title of Collonema a soft gelatiniform tumour of the brain (seen also in the breast), composed of grey-coloured cells, a few fibres and vessels, and acicular cystals, soluble in boiling aether. The re- actions of the growth in the brain most closely corresponded to those of ptyalin (?) ; that in the breast contained -a minute quantity of casein. SUB-ORDER II. INFILTRATING GROWTHS. CANCER OR CARCINOMA.* In this sub-order we place as a genus the product Carcinoma, containing three species — encephaloid or soft, scirrhus or hard, and colloid or jelly-like, Carcinoma. "The union of these three morbid structures," as we have elsewhere observed, " into a distinct genus, is, in truth, not a mere nosological artifice: it is manifest that the formations, to which I thus apply the generic term cancer, possess characters entitling them to be grouped to- gether, and separated from all others to the generation of which the organism is ex- posed. They agree anatomically, for they are all composed of elements forming a combina- tion without its counterpart, either in other adventitious products or in the natural struc- tures : they agree chemically, for they are ail distinguished by the vast predominance of protein-compounds in their fabric ; they agree physiologically, for they all possess in them- selves the power of growth and of extending by infiltrating surrounding -tissues, and so producing an appearance of assimilating to their proper substance the most heterogene- ous materials,—an inherent 'tendency to de- struction, and the local reproduc- tion ; they agree pathologically, for they all tend to affect simultaneously or consecutively various organs in the body, and produce that de
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