Scientific American Supplement, No. 470, January 3, 1885 eBook

This eBook from the Gutenberg Project consists of approximately 124 pages of information about Scientific American Supplement, No. 470, January 3, 1885.

Scientific American Supplement, No. 470, January 3, 1885 eBook

This eBook from the Gutenberg Project consists of approximately 124 pages of information about Scientific American Supplement, No. 470, January 3, 1885.
bad to fabrics so colored; but the practical dyer or calico printer knows that though he employs these poisonous bodies in his business, and that some portion of them does actually accompany the dyed material in its finished state, not only is the quantity excessively small, but that it is in such a state of combination as to be completely inert and innoxious.  In the case of tartar emetic, it is the tannate of antimony which remains upon the cloth, a compound of considerable stability, and almost perfectly insoluble in water; in the case of a few colors fixed by the arsenical alumina mordant, the arsenic is in an insoluble state of combination with the alumina, in fact, the poisons are in the presence of their antidotes, and not even the most scrupulous manufacturer has any fear that he is turning out goods which can be hurtful to the wearer.  Persons quite unacquainted with the process of dyeing are apt to think that goods are dyed by simply immersing them in a colored liquid and then drying them with all the color on them and all that the color contains; they do not know that in all usual cases of dyeing a careful washing in a plentiful supply of water is the final process in the dye-house, and that nothing remains upon the cloth which can be washed out by water, the color being retained by a sort of attraction or affinity between it and the fiber, or mordant on the fiber.  Dyeing is not like painting or even the printing or staining of paper for hangings, where the vehicle and color in its entirety is applied and remains.  It follows, therefore, that many chemicals used in dyeing have only a transitory use, and are washed away completely—­such as oil of vitriol, much used in woolen dyeing—­and that of others only a very minute quantity is finally left on the cloth, as is the case in antimony and arsenic in cotton dyeing and printing.

There is evidently among working dyers, as among all other classes, an unknown amount of carelessness, ignorance, and stupidity, from which employers are constantly suffering in the shape of spoiled colors and rotted cloth.  It is not for us to say that the public may not at times have to suffer also from neglect of the most common treatments which should remove injurious matters from dyed goods; what can be said is, that if the dyeing processes for aniline colors be followed out with ordinary care and intelligence, it is extremely improbable that anything left in the material should be injurious to human health.—­Manchester Textile Recorder.

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CASE OF RESUSCITATION AND RECOVERY AFTER APPARENT DEATH BY HANGING.

By ERNEST W. WHITE, M.B.  Lond., M.R.C.P., Senior Assistant Medical Officer to the Kent Lunatic Asylum; Associate, Late Scholar, of King’s College, London.

The following case, from its hopelessness at the outset, yet ultimate recovery under the duly recognized forms of treatment, is of such interest as to demand publicity, and will afford encouragement to others in moments of doubt.

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Scientific American Supplement, No. 470, January 3, 1885 from Project Gutenberg. Public domain.