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Geeat attention has of recent years been given to the study of Embryology, and yet it is curiously difficult to find straightforward accounts of the development even of the commonest animals. The special memoirs and monographs are usually limited to particular phases in the life-history of the forms with which they are concerned ;while the text-books of embryology aim rather at explaining the general progress of development within the several groups than at supplying complete descriptions of individual examples. Up to the present time there has been no reasonably complete account of the development of the common frog, or of the rabbit, in our own or in any other language; while in works professing to deal with human embryology it is more common than not to find that the descriptions, and the figures given in illustration of them, are really taken, not from human embryos at all, but from rabbits, pigs, chicken, or even dogfish. This latter practice is a most unfortunate one, and has been the cause of much confusion. The student is led to suppose that our knowledge is more complete than is really the case, while at the same time he finds the greatest difficulty in obtaining definite information on any particular point in which he is interested.
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