The Evolution of Man: A Popular Exposition of the Principal Points of Human Ontogeny and Phylogeny. From the German of Ernst HaeckelD. Appleton, 1897 - Anatomy, Comparative |
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Common terms and phrases
allantois amnion Amphibia Amphioxus appears Ascidian Baer Blastula blood-vessels body body-cavity brain Chick cleavage cleavage-cells coalescence cœlom Comparative Anatomy cytula Darwin developed division dorsal egg-cell egg-cleavage embryo entirely entoderm entoderm-cells Epigenesis exoderm fact formation furrow Gastræa Gastrula germ germ-area germ-disc germ-history germ-membrane germ-shield germinal gill-openings glands globular Heredity higher Vertebrates History of Evolution horn-plate human embryo important individual inner intestinal canal intestinal cavity intestinal germ-vesicle intestinal layer intestinal tube intestinal-fibrous layer intestinal-glandular layer kenogenetic kernel Lamarck Lancelet latter mammalian Mammals medullary tube membrane Morula natural naturalists notochord nucleolus nutritive yelk ontogenetic Ontogeny original outer palingenetic parent-cell phylogenetic Phylogeny Plate primary germ-layers primitive intestinal primitive kidneys primitive vertebral protoplasm Protozoa reproduction rudiment separates simple cell skin skin-fibrous layer skin-layer skin-sensory layer species sperm-cells spinal tube stage surface Theory of Descent tion Transverse section various ventral vertebral column vesicle wall whole Wolff Worms yelk-sac
Popular passages
Page 93 - Quadrumana, as surely as would the common and still more ancient progenitor of the Old and New World monkeys. The Quadrumana and all the higher mammals are probably derived from an ancient marsupial animal, and this through a long...
Page 6 - 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...
Page 112 - ... 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
Page 95 - Darwin's theory, properly so called, is this simple idea : that the. Struggle for Existence in Nature evolves new Species without design, just as the Will of Man produces new Varieties in Cultivation with design.
Page 60 - All the numerous tissues of the animal body, such as the entirely dissimilar tissues of the nerves, muscles, bones, outer skin, mucous skin, and of other similar parts, are originally composed of cells; and the same is true of all the various tissues of the vegetable body. These cells, which we shall hereafter consider more closely, are independent living beings, the citizens of the state, which constitute the entire multi-cellular organism.
Page 3 - I will only mention that most "educated people" do not even know that each human individual is developed from an egg, and that this egg is a simple cell, like that of any animal or plant. They are also ignorant of the fact that, in the development of this egg, an organism is first formed which is entirely different from the fully developed human body, to which it bears no trace of resemblance. The majority of "educated people...
Page 21 - ... Morphology, the science of forms, aims at a scientific understanding of organic structures, of their internal and external proportions of form. Physiology, the science of functions, on the other hand, aims at a knowledge of the functions of organs, or, in other words, of the manifestations of life. Physiology, however, has, especially during the last twenty years, been far more one-sided in its progress than morphology. Not only has it entirely neglected to apply the comparative method, by which...
Page 131 - We then see that it performs all the essential life functions which the entire organism accomplishes. Every one of these little beings grows and feeds itself independently. It assimilates juices from without, absorbing them from the surrounding fluid. The naked cells can even take up solid particles at any point of their surface and therefore eat without using any mouth or stomach.
Page 22 - ... evolution of the form of the intestinal canal, the lungs, and the organs of generation, affords us also most important information as to the evolution of the respective functions of these organs. This important relation is most clearly seen in the history of the evolution of the nervous system. In the economy of the human body, this system performs the functions of sensation, of voluntary movement, volition, and finally the highest psychical functions, namely, those of thought; in a word, every...
Page 352 - ... embryo of Man and that of other Vertebrates in early stages of individual development. This agreement is the more complete, the earlier the period at which the human embryo is compared with those of other Vertebrates. It is retained longer, the more nearly related in descent the respective matured animals are — corresponding to the " law of the ontogenetic connection of systematically related forms.