. A system of obstetrics . Practically, the blades do not grasp the head exactly in its antero-p rterior diam-eter, hut in an oblique direction intermediate between the antero-posterior and transvi ree. 1 h is argued by the advocates of iliis plan thai lateral compression is more apt (•>overcome disproportion by increasing the sntero-poeterior measurements at the expense<it i he lateral, and that compression sntero-posteriorly is apt t increase the dispropor-tion by bulging out the head laterally. Though theoretically plausible, practicallythis vim is incorrect; for experiments have abun

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. A system of obstetrics . Practically, the blades do not grasp the head exactly in its antero-p rterior diam-eter, hut in an oblique direction intermediate between the antero-posterior and transvi ree. 1 h is argued by the advocates of iliis plan thai lateral compression is more apt (•>overcome disproportion by increasing the sntero-poeterior measurements at the expense<it i he lateral, and that compression sntero-posteriorly is apt t increase the dispropor-tion by bulging out the head laterally. Though theoretically plausible, practicallythis vim is incorrect; for experiments have abundantly shown that when the ;blades are applied at the sides of the pelvis where there is most room . the head ismoulded upward in the direction of least resistance, and not laterally, where it encoun-ters the resistance of a narrow © njugate.Vol. II.—to 242 VERSION. the head has been brought down into the cavity, and completing deliv-ery by the manual method. There is nothing to be gained by so doing, Fig. 98.. Forceps Delivery of the After-coming Head in dorso-anterior positions. but, on the contrary, valuable time may be lost: it is better, therefore, to complete delivery by means of the forceps. When the head is prevented from descending by stricture of the osor cervix or contraction of the cervix around the childs neck, the for-ceps will be found particularly useful. It rapidly dilates the constricted Fig. 99.