The Evolution of Man: A Popular Exposition of the Principal Points of Human Ontogeny and Phylogeny, Volumen1Appleton, 1879 |
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Términos y frases comunes
allantois amnion Amphibia Amphioxus aorta appears Ascidian axis Baer Blastula blood-vessels body body-cavity Chick chorda cleavage cleavage-cells coalescence cœlom Comparative Anatomy cytula developed dorsal egg-cell egg-cleavage embryo entirely entoderm entoderm-cells exoderm fibrous layer formation formative yelk four secondary germ-layers furrow Gastræa Gastrula germ germ-area germ-disc germ-history germ-membrane germ-shield germination gill-openings glands globular Heredity higher Vertebrates History of Evolution horn-plate human embryo important individual inner intestinal canal intestinal germ-vesicle intestinal layer intestinal tube intestinal-fibrous layer intestinal-glandular layer kenogenetic kernel Lancelet latter lower mammalian Mammals many-celled medullary tube membrane Morula muscles natural notochord nutritive yelk Ontogeny organs original outer skin palingenetic parent-cell phylogenetic Phylogeny Plate primary germ-layers primitive intestinal cavity primitive kidneys primitive mouth primitive vertebral protoplasm Protozoa rudiment separates sexual side skin-fibrous layer skin-layer skin-sensory layer species sperm-cells spinal tube stage surface Theory of Descent tion ventral wall vertebral column vesicle whole Worms yelk-sac zona pellucida
Pasajes populares
Página 91 - We thus learn that man is descended from a hairy quadruped, furnished with a tail and pointed ears probably arboreal in its habits, and an inhabitant of the Old World.
Página 4 - This fundamental law, to which we shall recur again and again, and on the recognition of which depends the thorough understanding of the history of evolution, is briefly expressed in the proposition that the history of the germ is an epitome of the history of the descent...
Página 110 - ... the idealist scholar who closes his eyes to the real truth, or the priest who tries to keep his spiritual flock in ecclesiastical leadingstrings, can any longer tell the fable of the
Página 441 - See also blastostyle. blast'ula (Zool.). A hollow sphere, the wall of which is composed of a single layer of cells, produced as a result of the cleavage of an ovum.