This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1878 edition. Excerpt: ... chapter xii. The Organs Of Excretion. The earliest stages in the development of the excretory system have already been described in a previous chapter' of this memoir, and up to the present time no investigator, with tbe exception of Dr Alex. Schultz," has gone over the same ground. Dr Schultz' ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1878 edition. Excerpt: ... chapter xii. The Organs Of Excretion. The earliest stages in the development of the excretory system have already been described in a previous chapter' of this memoir, and up to the present time no investigator, with tbe exception of Dr Alex. Schultz," has gone over the same ground. Dr Schultz' descriptions are somewhat brief, but differ from my own mainly in stating that the segmental duct arises from an involution instead of as a solid knob. This discrepancy is, I believe, due to Dr Schultz drawing his conclusions as to the development of the segmental duct from its appearance at a comparatively late stage. He appears to have been unacquainted with my earlier descriptions. The adult anatomy and later stages in the development of the excretory organs form the subject of the present chapter, and stand in marked contrast to the earlier stages in that they have been dealt with in a magnificent monograph3 by Professor Semper, whose investigations have converted this previously almost unknown field of vertebrate embryology into one of the most fully explored parts of the whole subject. Reference is frequently made to this monograph in the succeeding pages, but my references, numerous as they are, give no adequate idea of the completeness and thoroughness of Professor Semper's investigations. In Professor Semper's monograph are embodied the results of a considerable number of preliminary papers published by him in his Arbeiten and in the Centralblatt. The excretory organs of Elasmobranchs have also formed the subject of some investigations by Dr Meyer1 and by myself. Their older literature is fully given by Professor Semper. In addition to the above-cited works, there is one other paper by Dr Spengel" on the Urinogenital System of Amphibians, ...
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