. Evenings at the microscope : or, Researches among the minuter organs and forms of animal life . Zoology; Microscopy; Microscopes. 32 EVENINGS AT THE MICROSCOPE. The larger ones do indeed; and their course is from the extremity of the toes towards the body: these are the veins; but the smaller streamlets flow in any direction, and frequently send out side-branches, which presently return into the stream from which they issued, or unite with others in a very irregular net-work. These are the capillaries which feed the veins, and which are themselves fed by the arteries, whose course is in the
. Evenings at the microscope : or, Researches among the minuter organs and forms of animal life . Zoology; Microscopy; Microscopes. 32 EVENINGS AT THE MICROSCOPE. The larger ones do indeed; and their course is from the extremity of the toes towards the body: these are the veins; but the smaller streamlets flow in any direction, and frequently send out side-branches, which presently return into the stream from which they issued, or unite with others in a very irregular net-work. These are the capillaries which feed the veins, and which are themselves fed by the arteries, whose course is in the oppo- site direction, viz., from the body. These, however, are with dif- ficulty seen: they are more deeply seated in the tissues, and are less spread over the webs, being generally placed along the bor- ders of the toes; they are, moreover, fewer and smaller than the veins ; but the blood in them usually flows with more impetuous rapidity. The variations in the impetus of the current which we observe in the same vessel are probably owing to the men- tal emotions of the animal; alarm at its unusual position, and at the confinement which it feels when it endeavours to move, may suspend the action of the heart, and thus cause an interruption in the flow; or analogous emotions may quicken the pulse. We will, however, now release our little prisoner, who, though glad to be at liberty, is, as you see, none the worse for his temporary imprisonment. Let us now look at the circulation of the blood in one of. the Invertebrate Animals. In this thin glass cell of sea-. CIHCULATION IN FROG'S Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gosse, Philip Henry, 1810-1888. London : Society for Promoting Christian Knowledge
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