The main currents of zoölogy . e publisheda text-book of Histology in 1857 and, thereafter, forforty years he continued to make contributions tothis division of science. His great book on the tissues(Handbuch. der Gewebelehre) passed through severaleditions from 18 70 to 1897. It was thoroughly revisedand brought down to date in the years 1894-1897. The plant histologists, Grew and Malpighi, of theeighteenth century made interesting observationsand published many sketches of the microscopic ap-pearance of plant tissues. These sketches, whichwere faint foreshadowings of the cell idea, can beexa
The main currents of zoölogy . e publisheda text-book of Histology in 1857 and, thereafter, forforty years he continued to make contributions tothis division of science. His great book on the tissues(Handbuch. der Gewebelehre) passed through severaleditions from 18 70 to 1897. It was thoroughly revisedand brought down to date in the years 1894-1897. The plant histologists, Grew and Malpighi, of theeighteenth century made interesting observationsand published many sketches of the microscopic ap-pearance of plant tissues. These sketches, whichwere faint foreshadowings of the cell idea, can beexamined by those sufficiently interested to lookup the works of Grew and Malpighi. CUVIER AND STRUCTURAL ZOOLOGY 69 Leydig (1821-1908), in 1864, applied histology toinsects and other invertebrates. Virchow developed a line of abnormal histologywhich figures now under the name Pathology. Thusstructural studies of the tissues under the microscopehave given rise to normal histology and abnormal(pathological) histology or CHAPTER VIITHE RISE OF EMBRYOLOGY AFTER the comparative anatomy of Cuvier waswell under way came the establishment of embryol-ogy in which von Baer (1797-1876) was the centralfigure. In 1828, by the publication of his detailedobservations on the development of the chick andother animals (1834), he established the germ-layeridea and carried the science of the development ofanimals to a high level. Embryology is supplemental to comparative anat-omy and in its present stage of development is to beclassified as a morphological subject. It is not pos-sible to appreciate in its full meaning any structuralproblem of zoology without the assistance of em-bryological study. The adult condition of an or-ganism is the result of a series of changes, it is, infact, the last step in a long series of modificationsthat have occurred in the process of building thebody from the single-celled condition of the egg to itscompleted state. These modifications are so pro-found
Size: 1961px × 1274px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkhholtandcom
