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There is a presumption against putting lead or arsenic into the human body, as against putting them into plants, because they do not belong there, any more than pounded glass, which, it is said, used to be given as a poison. The same thing is true of mercury and silver. What becomes of these alien substances after they get into the system we cannot always tell.
The other will feed not only on dead animal substances, but on living creatures, and is equipped with sharp teeth, which work like a saw. One of these kept in an aquarium fastened on to and slowly devoured a small frog confined in the same vessel. The large dytiscus beetle is the great enemy of small fish.
Since these are the main substances acted on in the stomach, the time required for their digestion is shortened by eating them first. Sugar, being of the nature of predigested starch, quickly gets into the blood and satisfies the relish for food. The result of taking sugar first may be to cause one to eat less than he needs and to diminish the activity of the glands.
Thanks to the immense series of labors thus inaugurated, the following fundamental truths have been established. All living bodies contain substances of closely similar physical and chemical composition, which constitute the physical basis of life, known as protoplasm. So far as our present knowledge goes, this takes its origin only from pre-existing protoplasm.
If the calf is opened up after death, there will be found in the stomach a large, firm, round ball composed of straw, hair, and other substances, with knots of curdled milk conjoined. After the calf has got the cud, and is fourteen days old, it may be allowed to suck at pleasure.
Of course, the ritual regulations for writing the holy books, the special preparation of the parchment, the ink, the strict rules for the formation of the letters, hardly fall within the province of this article. In ancient times the most diverse substances were used for writing on. Some authorities believe that in the time of Moses the palm leaf was the ordinary writing-material.
When we see, hear, smell, taste, feel, meditate, or will anything, we know that we do so. Thus it is always as to our present sensations and perceptions: and by this every one is to himself that which he calls SELF: it not being considered, in this case, whether the same self be continued in the same or divers substances.
At first blush it seems a very marvellous thing, this liquefaction of substances that under all ordinary conditions are gaseous. It is certainly a little startling to have a cup of clear, water-like liquid offered one, with the assurance that it is nothing but air; still more so to have the same air presented in the form of a white "avalanche snow."
The natural operation of time upon the surface of this earth is to dissolve certain substances, to disunite the solid bodies which are not soluble, but which, in having been consolidated by fusion, are naturally separated by veins and cutters, and to carry those detached bodies, by the mechanic force of moving water, successively from stage to stage, from places of a higher situation to those below.
The former are capable of conversion into blood; the latter are incapable of this transformation. Out of those substances which are adapted to the formation of blood, are formed all the organised tissues. The other class of substances, in the normal state of health, serve to support the process of respiration.
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