. An elementary course in practical zoölogy [microform]. Zoology; Zoologie. V- Ba THE rROG. a. h. c. To the head, the carotid. To the body generally, the aorta. Trace the two aortae, right and left, to their point of union near the spleen. To the lungs and skin, the pulmo-cutaneous. Part of the impure blood is sent to the skin, through which it gets oxygen. In this way the frog gets oxygen when under water for a long time, and during the winter, when it hibernates deep down in the mud. Remove the heart. Does it beat after removal from the body? Note the effect of holding the heart in the palm
. An elementary course in practical zoölogy [microform]. Zoology; Zoologie. V- Ba THE rROG. a. h. c. To the head, the carotid. To the body generally, the aorta. Trace the two aortae, right and left, to their point of union near the spleen. To the lungs and skin, the pulmo-cutaneous. Part of the impure blood is sent to the skin, through which it gets oxygen. In this way the frog gets oxygen when under water for a long time, and during the winter, when it hibernates deep down in the mud. Remove the heart. Does it beat after removal from the body? Note the effect of holding the heart in the palm of the hand. Note the effect of pricking it with a needle. CIRCULATION OP BLOOD IN THE WEB OP A FROG's FOOT. Split a cigar-box cover or shingle in the middle, and cut a V-shaped notch in one end; wrap the frog in a wet cloth, with one leg projecting, and tie it thus wrapped to the board; tie threads around two of the toes, and stretch the web (but not too tightly) over the V-shaped notch; place the board firmly on the stage of the microscope. Examine first xvith a one-inch objective. The large ves- sels which grow smaller by subdivision are the arteries. Tlie large vessels which are formed by the union of smaller ones are the veins. The finer vessels forming a network are the capillaries; the black spots are pigment cells. Where these are very abundant, they make dark spots, as seen on the frog's back. Take a triangular piece of cover- glass a little smaller than the web under examination; place a small drop of water on one side of it, and lay the glass, with the Avater downwards, on the web. Put. on a. 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 Colton, Buel P. (Buel Preston), 1852-1906. Halifax, N. S. : T. C. Allen; Boston : D. C. Heath
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
