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adult animal anlagen anterior appear arise artery auditory vesicle become body brain caudad cells cerebral changes closely commissure COMPARATIVE connection cord corresponding cortex course cranial nerves cytoplasm definite derived described determine differentiated dorsal early embryo enter epibranchial placode epidermis evidence experiments extends fact farther fibers figures four frog functional ganglia ganglion give rise hemisphere hippocampi indicated JOURNAL lamina lateral mass lateralis length less mammals median medullary method migrate mouse nervous system neural crest neural tube nucleus observed olfactory organs origin pars passes percentage peripherally placode plexuses portion position posterior preparations present primordium probably region relation roots rostral seems seen separated shown side similar spinal nerves stage structure sulcus sympathetic trunks taken teleosts terminalis thalami tion traced tract urodeles vagus ventral vertebrates visceral walls
Page 138 - ... if the states of consciousness which a creature endeavours to maintain are the correlatives of injurious actions, and if the states of consciousness which it endeavours to expel are the correlatives of beneficial actions, it must quickly disappear through persistence in the injurious and avoidance of the beneficial.
Page 193 - CR 1906 The development of the thyroid gland in Bdellostoma Stouti. Anat. Anz., Bd. 29. WHEELER 1899 The development of the urogenital organs of the lamprey. Zool. Jahrb., Bd. 13. WILLY, A. 1894 Amphioxus and the ancestry of the vertebrates. New York. PLATE 1 EXPLANATION OF FIGURES All figures were drawn with the aid of the camera lucida. Higgin's carmine and true blue inks were used to reproduce the colors of the stained sections represented in the colored plate. 1 Lymphoid accumulation in the lateral...
Page 142 - Or, on the other hand, we suppose the spontaneous movements to give pain, and assume that, with the pain, there will be a decrease of energy, extending to the movements that cause the evil, and thereby providing a remedy. A few repetitions of the fortuitous concurrence of pleasure and a certain movement, will lead to the forging of an acquired connection, under the law of retentiveness or contiguity, so that, at an after time, the pleasure or its idea shall evoke the proper movement at once.
Page 140 - If we substitute for the word Pleasure the equivalent phrase — a feeling which we seek to bring into consciousness and retain there...
Page 142 - That is to say, the lines of nervous communication through which the diffused discharge happened in this case to pass, have opened a new way to certain wide channels of escape; and, consequently, they have suddenly become lines through which a largo quantity of molecular motion is drawn, and lines which are so rendered more permeable than before.
Page 142 - Pleasure and pain can be agents of accommodation and development only if the one, pleasure, carry with it the phenomenon of "motor excess," and the other, pain, the reverse — probably some form of inhibition or of antagonistic contraction.
Page 539 - Subscriptions and all business correspondence should be addressed to THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 36TH STREET AND WOODLAND AVENUE PHILADELPHIA, PA.
Page 138 - ... the average, agreeable or desired feelings went along with activities conducive to the maintenance of life, while disagreeable and habitually-avoided feelings went along with activities directly or indirectly destructive of life ; and there must ever have been, other things equal, the most numerous and long-continued survivals among races in which these adjustments of feelings to actions were the best, tending ever to bring about perfect adjustment.
Page 142 - ... quantity of molecular motion is drawn, and lines which are so rendered more permeable than before. On recurrence of the circumstances, these muscular movements that were followed by success are likely to be repeated : what was at first an accidental combination of motions will now be a combination having considerable probability.