THENCE this consequence seems derivable, that to obviate these difficulties and dangers, it would be requisite to have as many crooked spoons as there are particular cases, as well as to take measure of the heads that are stuck, which still would imply the introduction of the hand, and, of course, the uselessness of instruments. MR. Levret, in his notes, p. 377, makes us observe, that the branches of the forceps of Bingius, which are solid, being considerably more crooked than the windowed forceps, the expansion of their middle part must be too wide not to risque, in the extraction, the _tearing_ the perinæum, which it is no such _indifferent_ matter as not to be remarked. THIS Janckius had, it seems, that bad habit of employing too _soon_ the instrument of Bingius, which is extremely dangerous. This however, is not seldom the case, when Monsieur l’Accoucheur is in a hurry. BOËHMER, in a dissertation on this subject, thus expresses himself, as to the instrument of Levret, and the forceps of Bingius. “I shall only observe (says that learned physician) what Mr. Levret has himself very justly remarked, that the application of the forceps is dangerous, unless the head should have already descended low enough into the pelvis for the orifice of the uterus to be effaced, and to make but one and the same cavity with the vagina. This counsel is essential for two reasons; “FIRST, for fear of hurting the orifice of the uterus which might easily happen without this precaution. “SECONDLY, on account of the instrument itself, the blades of which could not embrace more than a part, and not the whole of the head, which remaining too high, they could not consequently compress it equally, nor extract it. It is for the same reasons (continues he) that I rather differ in opinion from the celebrated Janckius, who, as soon as the waters are discharged, and he perceives that the head does not pass, has instantly recourse to the instrument.... Some time (says he) should be indulged to the action of Nature.... There is often more success obtained by temporising, than by too early a recourse to instruments.”