. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. lar by the occur- irot of them are W ifter Moens). x, com* ; C, dicrotic locondary lii»; 0, â¢uccecdina sec- wlth ten doable vlbn* I Bucoeeding ones a to be the more in the caliber of a sort of pulse, â essure, a venous >f the best-known . When, during sulse may be wit- open out, owing ly is sufficiently iisease, owing to rise to incompe- h. each ventriou- the neck, be evi
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. lar by the occur- irot of them are W ifter Moens). x, com* ; C, dicrotic locondary lii»; 0, â¢uccecdina sec- wlth ten doable vlbn* I Bucoeeding ones a to be the more in the caliber of a sort of pulse, â essure, a venous >f the best-known . When, during sulse may be wit- open out, owing ly is sufficiently iisease, owing to rise to incompe- h. each ventriou- the neck, be evident, that ins that the usual ng overstepped, ideration of phe- e call attention to umal, in order to pare-him for the I to in subsequent tarrow limits (re- mammals) having )ly new aspects of THE CIRCULATION OP THE BLOOD. 245 cardiac physiologyâone might almost say revolutionized the subject. Owing to the limitations of our space, the references to lower forms must be brief. We recommend the student, however, to push the subject further, and especially to carry out some of the experiments to which attention will be directed very shortly. In the lowest organisms {Infuaoriana) represented by Amoe- ba, Vorticella, eto., there are, of course, no circulatory organs, unless the pulsating vacuoles of some forms mark tiie crude beginnings of a heart. It will be borne in mind, however, that there is a constant streaming of the protoplasm itself within the organism. The heart is first represented, as in worms, by a pulsatile tube, which may, as in the earth-worm, extend throughout the greater part of the length of the animal, and has usually dorsal and ventral and transverse connections The dilatations of the transverse portions in one division {metamere) of the animal seem to foreshadow the appearance of auricles. The pulsation of the dorsal vessel in a large earth-worm is easy of observation. In amphioxus, which is often instanced as the lowest verte- brate, the blood-vesse
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