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Updated: May 29, 2025
That the excessively low refractive power of tabasheer is connected with the mechanical admixture of the colloidal silica with air seems to be proved by the experiments of Brewster, showing that with increase of density there was an increase in the refractive index from 1.111 in specimens of the lowest specific gravity to 1.182 in those of the highest specific gravity.
"A further action upon the blood, instituted by alcohol in excess, is upon the fibrine or the plastic colloidal matter. On this the spirit may act in two different ways, according to the degree in which it affects the water that holds the fibrine in solution.
There was a trampling of feet. The Kidnapping of Joan The Earthmen moved quickly and quietly into Joan's room. Thin, crinkly draperies of heavy silk impregnated with lead in colloidal solution, covered all the walls, the door itself. But Hilary shot no more than a cursory glance around; he had left the slide slightly ajar; he was listening intently. The gun was in his hand.
For instance, “while soluble crystalloids are always highly sapid, soluble colloids are singularly insipid,” as might be expected; for, as the sentient extremities of the nerves of the palate “are probably protected by a colloidal membrane,” impermeable to other colloids, a colloid, when tasted, probably never reaches those nerves.
Water passes freely through them, salts pass freely through them, but the constructive matter of the active parts that is colloidal does not pass; it is retained in them until it is chemically decomposed into the soluble type of matter.
It also teaches that colloidal matter, when exposed to certain conditions, presents the phenomena of life, and that it can be formed from crystalline matter, and thus that the prima materia of which these are diverse forms contains potentially all the multitudinous kinds of animal and vegetable existence.
It is biotic energy which guides the development of the ovum, which regulates the exchanges of the cell, and causes such phenomena as nerve impulse, muscular contraction, and gland secretion, and it is a form of energy which arises in colloidal structures, just as magnetism appears in iron, or radio-activity in uranium or radium, and in its manifestations it undergoes exchanges with other forms of energy, in the same manner as these do among one another."
We give it in the exact phraseology employed by Professor Bastian: "Living matter is formed by, or is the result of, certain combinations and rearrangements that take place in invisible colloidal molecules a process which is essentially similar to the mode by which higher organisms are derived from lower in the pellicle of an organic infusion."
That eminent chemist was the first who drew attention to the distinction which may be made of all substances into two classes, termed by him crystalloids and colloids; or rather, of all states of matter into the crystalloid and the colloidal states, for many substances are capable of existing in either.
The treatment of cancer by other than operative methods has received a great deal of attention within recent years, and many agents have been put to the test, e.g. colloidal suspensions of selenium, but without any positive results. Most benefit has resulted from the use of radium and of the X-rays, and one or other should be employed as a routine measure after every operation for cancer.
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