. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . to become familiar with its own structure. 2. To supplementthis with reading theanatomical descrip-tions, without too greatattention to details atfirst, but with the ob-ject of getting his ideasclear so far as they go. 3. Then, with platesand descriptions beforehim, to examine sever-al dead specimens ofthe heart of the sheep,ox, pig, or other mam-mal, first somewhatgenerally, then syste-matically, with thepurpose of getting amore exact knowledgeof the various struct-ures and their anat
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . to become familiar with its own structure. 2. To supplementthis with reading theanatomical descrip-tions, without too greatattention to details atfirst, but with the ob-ject of getting his ideasclear so far as they go. 3. Then, with platesand descriptions beforehim, to examine sever-al dead specimens ofthe heart of the sheep,ox, pig, or other mam-mal, first somewhatgenerally, then syste-matically, with thepurpose of getting amore exact knowledgeof the various struct-ures and their anatom-ical as well as physi-ological relations. We would not havethe student confine hisattention to any singleform of heart, for eachshows some one struct-ure better than theothers ; and the addi-tional advantages ofcomparison are verygreat. The heart ofthe ox, from its size,is excellent for the study of valvular action, and the frameworkwith which the muscles, valves, and vessels are connected ;while the heart of the pig (and dog) resemble the human organmore closely than most others that can be In;. 186.—The left auricle and ventricle opened andpari of their walls removed to show their cavities(Allen Thomson). 1, right pulmonary vein cutshort; V, cavity of left auricle; 3, thick wall ofleft ventricle ; 4, portion of the same with pap-illary muscle attached ; 5, 5, the other papillarymuscles; 0, one segment of the mitral valve; 7,in aorta is placed over the semilunar valves. THE CIRCULATION OF TI1E BLOOD. 217 It will be found very helpful to perform some of the dissec-tions under water, and by the use of this or some other fluidthe action of the valves may be learned as it can in no otherway. By a little manipulation the heart may be so held thatwater may be poured into the orifices, prepared by a removalof a portion of the blood-vessels or the auricles, when the valvesmay be seen closing together, and thus revealing their action ina way which no verbal or pictorial
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1890
