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Updated: May 25, 2025
Addition of halogen to one of the unsaturated acids yields on subsequent examination an invariable quantity of the former, representing two or four atoms, according to one or the other of unsaturated groups; and as the molecular weights of fatty acids are unequal, the percentage quantity of halogen will be found varying with regard to members belonging to the same series.
"I have seen so many new things here, I wonder if it may not be the element that precedes niton. Is it heavier than that?" "No," replied Tonlos; "it is just lighter than that element you call niton. I think you have none of it." "Then," said Arcot, "it must be the next member of the halogen series, Morey. I'll bet they have a number of those heavier elements."
Animal fats, absorb comparatively less halogen than vegetable fats, and the power to combine with iodine increases with the transition from the solid to the liquid state, and attains its maximum with vegetable oils the method being adapted to the examination of fat mixtures containing glycerides and free saturated fatty acids, provided that substances which under similar conditions combine with iodine are absent.
The sensitizing effect of one silver compound upon another was then gone into, and experiments and photographs showed where two salts of silver were in contact with one another, and without an energetic sensitizer being at hand, that the one when acted upon by light absorbed the halogen liberated from the other through the same cause and that a new molecule was formed.
I do not know whether you have tried that on Terrestrial animals or not. Luckily sorlus is the most plentiful of the halogen groups; we have far more of it than of chlorine, bromine or iodine." "Sorlus? I do not know of it it must be one of the other elements that we do not have on Earth. What are its properties?" "It, too, is much like iodine, but heavier.
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