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The haziness of the cornea and slight turbidity of the aqueous contribute greatly to the apparent change in the color of the iris. In cases of simple chronic glaucoma there is but little evidence of edema of the iris. As the disease progresses, the stroma of the iris atrophies and contracts. There is very little evidence of small-cell infiltration or the formation of cicatrical tissue.
In the earlier months of pregnancy the amniotic fluid is not abundant; later it increases rapidly, so that by the end of the period it measures about a quart, and frequently even more. The slightly yellow amniotic fluid is itself clear, but small particles of dead skin and other material cast off from the surface of the child's body are floating in it, and may cause turbidity.
When it steps out of such opposites, it destroys without a doubt the turbidity and evanescence of ordinary commonplace life, and separates clearly the lights and shadows from one another.
We are met almost at the threshold by a colossal epic, Creation, Man and the Messiah ; by songs that turn into dithyrambic odes, by descriptive pieces which embrace the universe, by all the froth and roar and turbidity of genius, with none of its purity and calm. The genius is there; it is idle to deny it; but it is in a state of violent turmoil.
To remove this kind of turbidity it is customary to use oak or beech shavings that have been washed in hot water and then dried. These shavings, which must be very long and extremely thin, are put in a barrel with a second and perforated bottom, to a depth of 12 to 34 inches.
There can be no doubt that the turbidity of the water was due to this powder in suspension. A little dissolves in the water, while the scales and incrustations in fine particles are carried along in the current. As a matter of fact the amount necessary to make the water poisonous need not be large." He applied a little instrument to the cut ends of the pipe.
To the latter question Gilbert replies that in the darkness color exists in posse, but not in esse. Again: "Why do some animals see at night, some in the day only and some only in the twilight?" This phenomenon he ascribes to "the clearness and subtilty of the visual spirits, or to the strength, weakness, grossness or turbidity of the organs of vision."
Filter through blotting paper, and to the clear filtrate add some phosphate of soda solution. A second precipitation proves the presence of magnesia. Sulphates. A solution of barium chloride and dilute hydrochloric acid gives a white turbidity. Chlorides. A solution of silver nitrate and nitric acid gives a white curdy precipitate. Test for Lead in Drinking Water.
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