. Godey's lady's book . reature at all, but bystretching the web of its foot over a piece ofwire gauze, or perforated zinc, and securing itthere by passing threads over its toes. Thebody of the frog was wrapped in a piece of wetcalico, and the one extended leg tied on to theslide by a piece of tape, not too tightly pressedupon it. At first, the alarm of the frog onfinding himself in such a new position stoppedthe action of the heart, and consequently thecirculation; but after a little time he seemedto become quite reconciled to his devotion toscience, and patiently resigned himself to hisfate.
. Godey's lady's book . reature at all, but bystretching the web of its foot over a piece ofwire gauze, or perforated zinc, and securing itthere by passing threads over its toes. Thebody of the frog was wrapped in a piece of wetcalico, and the one extended leg tied on to theslide by a piece of tape, not too tightly pressedupon it. At first, the alarm of the frog onfinding himself in such a new position stoppedthe action of the heart, and consequently thecirculation; but after a little time he seemedto become quite reconciled to his devotion toscience, and patiently resigned himself to hisfate. We were greatly delighted at the beau-tiful appearance of his web under the micro-scope. The circulation of the little globules ofblood were distinctly seen, and we could dis- THE DOUBLE TEST. 233 tinguish between the arteries and the veins(Fig. 9). After our observations on the goodpatient frog, the boys sympathy for the poorthing, which had to be kept still so long, in-duced him to exclaim, Now let us set the Fig. poor fellow free ! Taking out his pocket-knife to cut the tape which bound him, he gavehimself a sharp cut on the finger. Althoughmy boy was now beginning to feel himself aphilosopher, he had not quite lost the babytendency to pull a long face at the sight of hisown blood. He could bear a good knock withoutcrying, but he always looked to see if it bledbefore he made up his mind not to cry. Thisaccident caused sad looks and white lips, until,seeing a tiny drop of blood, I got one of our little glass slides, and catching it on the sur-face, I said, Let us see what your blood ismade of? Away flew all thought of pain orsorrow. There, instead of the bright red bloodwhich caused all the fright, were the beautifulround globules called blood-corpuscles (Fig-10). Fig. 10.
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