Text-book of comparative anatomy . und dcm Wachstlmm dcr TMcrc und Pflanzen. Berlin, 1839. LITERATURE 53 A. Kblliker. Mi&ros&opische Anutomie oder Gewelclchre dcs Menschen. 1850-54. 3 Parts. The same, ffandbuch der Geicebclchre dcs Menschen. 5th edition. Leipzig, Leydig. Lchrbuch dcr Histoloyic dcs Menschen und dcr Thicrc. Frankfurt, 1857. (A standard work.) The same. Vom Ban dcs thicrischen Korpcrs. Tubingen, 1864. Vol. I. with Frommann. Zur Lchre von dcr Strudur der Zcllcn. Jenaischc Zcitschrift fur Natnndss. Bd. IX. 1875. W. Flamming. Zcllsulstanz, Kern, Zdlthdlung. Leipzig
Text-book of comparative anatomy . und dcm Wachstlmm dcr TMcrc und Pflanzen. Berlin, 1839. LITERATURE 53 A. Kblliker. Mi&ros&opische Anutomie oder Gewelclchre dcs Menschen. 1850-54. 3 Parts. The same, ffandbuch der Geicebclchre dcs Menschen. 5th edition. Leipzig, Leydig. Lchrbuch dcr Histoloyic dcs Menschen und dcr Thicrc. Frankfurt, 1857. (A standard work.) The same. Vom Ban dcs thicrischen Korpcrs. Tubingen, 1864. Vol. I. with Frommann. Zur Lchre von dcr Strudur der Zcllcn. Jenaischc Zcitschrift fur Natnndss. Bd. IX. 1875. W. Flamming. Zcllsulstanz, Kern, Zdlthdlung. Leipzig, Frey. Handbucli dcr Histologic und Histochcmie des Mcnsclicn. 3d edition. Leipzig, Ranvier. Traite technique iVHistologic. A German translation of the same by Nicati and v. Wyss. Leipzig, Fol. Lclirbuch dcr verglcichcnden mikroskopischcn Anatomic. Leipzig, 1884. Till now only the first part has appeared, treating of technical Stbhr. Lchrbuch dcr Histolocjie. 2d edition. Jena, CHAPTER II Introduction to the study of the Metazoa—Ccelenterata or Zoophyta as thelowest Metazoa constructed essentially of two cell layers—Yolk segmenta-tion and formation of the two primitive germinal layers of the Metazoa(Gastraea theory). INTRODUCTION. IN contradistinction to Protista or Protozoa we have real Animals orMetazoa. The bodies of the former consist of one single cell or ofseveral similar cells (with the exception of Volvox), each of which, how-ever, is competent to perform all vital functions (cell colony); thebodies of Metazoa, on the contrary, always consist of a number of cellswhich are not all similar, but have divided among them the differentforms of vital activity (cell community). The division of labour maybe more or less complete, and according to it the degree of morpho-logical complexity and of physiological perfection is are animals which are morphologically (according to structure)and physiologically (accordin
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
