. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. 120 Bulletin So. Calif. Academy Sciences / Vol. 66, No. 2, ^5x^7 I ad. ab. ^^h ad. ab. X'X^""^'^'*^ Figure 2. Kymograph record of the heart of an agitated animal (Ascidia nigra). often, reversing four times in the first minutes of the record, twice the normal rate of reversal. The prolonged advisceral phase has no special significance, since such prolonged phases were found to occur occasionally under both normal and experimental conditions. To obtain the kymograph record sh
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. 120 Bulletin So. Calif. Academy Sciences / Vol. 66, No. 2, ^5x^7 I ad. ab. ^^h ad. ab. X'X^""^'^'*^ Figure 2. Kymograph record of the heart of an agitated animal (Ascidia nigra). often, reversing four times in the first minutes of the record, twice the normal rate of reversal. The prolonged advisceral phase has no special significance, since such prolonged phases were found to occur occasionally under both normal and experimental conditions. To obtain the kymograph record shown in Figure 3, the pressure of the glass weight resting on the heart was increased until the heart beating in the advisceral direction could just force blood past this block. Although this block was about three cm from the advisceral pacemaker, it resulted in a marked decrease in the pulse rate of the heart in the advisceral phase. The first three or four advisceral heart- beats occur much less frequently. The advisceral phase is also shorter than the abvisceral phase of a normal heart, although not as short as that of an agitated animal. The abvisceral heart rate was normal be- cause in this direction the stronger beat was able to pump blood past the block without difficulty. In addition to its effect upon the heart, agitation of the animal also caused the agglutination of the blood cells. When the test of the ani- mal is scraped or rubbed, clumps of blood cells become apparent in the blood vessels of the test. Unagglutinated blood is almost colorless, but after agglutination the blood appears to be bright yellow, the. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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