. Obstetrics: the science and the art. ation,then, is only an accident happening in the course of a pelvic present-ation—and the same may be said of the knee cases, which are veryrarely met with. 170. I recommend these views of presentations to the MedicalStudent, who, if he should adopt them, will find his notions of mid-wifery greatly simplified, and his memory not loaded with uselessdivisions and descriptions that serve only to embarrass him as astudent him as a scholar or practitioner. These are thedivisions I have proposed in my public lectures; and, having foundthem convenien
. Obstetrics: the science and the art. ation,then, is only an accident happening in the course of a pelvic present-ation—and the same may be said of the knee cases, which are veryrarely met with. 170. I recommend these views of presentations to the MedicalStudent, who, if he should adopt them, will find his notions of mid-wifery greatly simplified, and his memory not loaded with uselessdivisions and descriptions that serve only to embarrass him as astudent him as a scholar or practitioner. These are thedivisions I have proposed in my public lectures; and, having foundthem convenient also at the bedside, I with confidence advise himto prefer them to the long catalogue of presentations in the in its nature is simple, pure, non-complex; it owes itsseeming complexity and abstruseness only to man. 171. If the Student should ask me where I will place the present-ations of the belly or the back of the fa^tus, I cannot inform him, forI do liot know whether they bo derived from deviations of the pelvis. PRESENTATIONS AND POSITIONS. 91 or from deviation of tlie head. I am sure, however, that all suchcases are accidents either of the cephalic or of the pelvic presenta-tion, which is the essential point. Let the facts show whether thejwere cephalic or pelvic. 172. Positions of a Presentation.—The word position, as Isaid, refers to a relation between a certain cardinal part of the pre-sentation, and a certain cardinal part of the pelvis. Thus, in vertexpresentations, the posterior fontanel may be in the fifth posi-tion, that is to say, the occiput of the child may be directed to theleft sacro-iliac junction, and its forehead to the right acetabulum;but the cardinal point on the pelvis is the left acetabulum, fromwhich we count the first, second, third, fourth, fifth, and sixthpositions. Care should be used to avoid confounding the termspresentation and position, which are not convertible terms. 173. A vertex presentation is one in which the head p
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