Collected Papers, Volumen5The Laboratory, 1920 |
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Términos y frases comunes
Amblystoma amphibia blastulas body cannibal cells Chloromyxum leydigi chromatin conjugation control larvae cord cytoplasm decrease differentiation Difflugia division rate dorsal embryos endomixis experimental experiments figure fission frog function Gehirn gland growth hay infusion Huhn Hühner Hühnerpest hypophysis hypotrichous Impfung intact limb intermictic period Jennings Kerne Knochenmark larger limb level limb rudiment Line IE Line Ohr lobes mass cultures mean breadth mean length medium ment metamorphosis micronucleus muscles Myxosporidien neutral red normal limb normal position observed occurred oocytes organs ovaries Oxytricha Paramecium Plasma plexus present reduplication regenerated relatively segmental nerve segments posterior segregation granule Serum shoulder-girdle shown shows single animals species specimens spermaries spinal Spore stained standard deviation structure Stylonychia subcultures thymus thyroid thyroidless larvae Tiere tissue transplanted limb trypan blue twin vacuole variation ventral virulentes Virus waren Woodruff wurde wurden young frogs Zellen
Pasajes populares
Página 249 - The next care to be taken, in respect of the senses, is a supplying of their infirmities with instruments, and, as it were, the adding of artificial organs to the natural.
Página 258 - Death hindred him) having but a light Body to carry, and a great deal of Spirits and Activity, especially in his youth. He was of an active, restless, indefatigable Genius, even almost to the last, and always slept little to his Death, seldom going to Sleep till two, three, or four o'clock in the Morning and seldomer to Bed, oftener continuing his Studies all Night, and taking a short Nap in the Day. His temper was Melancholy, Mistrustful, and Jealous, which more increas'd -upon him with his years.
Página 249 - It seems not improbable, but that by these helps the subtilty of the composition of Bodies, the structure of their parts, the various texture of their matter, the instruments and manner of their inward motions, and all the other possible appearances of things, may come to be more fully discovered...
Página 134 - Chester, in 1584 published a book to which he gave the modest title " The Haven of Health." At the time of the publication Queen Elizabeth had -been on the throne twenty-six years. Four years later the Spanish Armada was to be ingloriously swept from the seas by a combination of British valor and unfriendly winds. Three years were still to pass before William Shakespeare would move to London. The jubilee of learning was soon to be at its full height. Galen was still the god of biological science,...
Página 249 - A, and a vast number of new Stars, and new Motions, and new Productions appear in them, to which all the antient Astronomers were utterly Strangers. By this the Earth it self, which lyes so neer us, under our feet, shews quite a new thing to us, and in every little particle of its matter, we now behold almost as great a variety of Creatures, as we were able before to reckon up in the whole Universe it self.
Página 250 - I am abundantly satisfied; and all my ambition is, that I may serve to the great Philosophers of this Age, as the makers and the grinders of my Glasses did to me ; that I may prepare and furnish them with some Materials, which they may afterwards order and manage with better skill, and to far greater advantage.
Página 264 - ' and we conclude the survey of this man of the past still using the words' of the past : All his Errors and Blemishes, were more than made amends for, by the Greatness and Extent of his natural and acquired Parts, and more than common, if not wonderful Sagacity, in diving into the most hidden Secrets of Nature, and in contriving proper Methods of forcing her to confess the Truth, by driving and pursuing the Proteus thro...
Página 263 - Here are clearly described for the first time the "little boxes or cells" of organic structure, and his use of the word "cell" is responsible for its application to the protoplasmic units of modern biology.
Página 249 - Telescopes, there is nothing so far distant but may be represented to our view; and by the help of Microscopes, there is nothing so small, as to escape our inquiry; hence there is a new visible World discovered to the understanding.
Página 258 - Bed, often continuing his Studies all Night, and taking a short Nap in the Day. His Temper was Melancholy, Mistrustful and Jealous, which more increas'd upon him with his Years. He was in the beginning of his being made known to the Learned, very communicative of his Philosophical Discoveries and Inventions, till some Accidents made him to a Crime close and reserv'd. He laid the cause upon some Persons, challenging his Discoveries for their own, taking occasion from his Hints to perfect what he had...