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actions active aggregates alimentary canal animals arise arrangement axes axis bear become bilateral body bones branches carried cause cells changes characters common comparatively complete compound consider contained continue contrast differentiation direct distribution effects ends environment equal established evidence evolution exist exposed extreme facts fertility flowers forces fronds functions further genesis give greater growing growth habitually Hence higher implies increase individuals inner integration interpretation kind lateral layer leaf leaves less liquid marked mass matter mechanical mode modifications morphological motion natural nutrition observed occur organs original outer pass physiological plants portion position present produced radial relations relative remains result seen segments separate shape shown sides similarly simple species stem strains structure substance supply surface symmetry tion tissue units unlike upper various vertebrate vessels whole
Page 589 - Our Place among Infinities : A Series of Essays contrasting our Little Abode in Space and Time with the Infinities Around us.
Page 589 - NICHOLSON. A Manual of Zoology, for the use of Students. With a General Introduction on the Principles of Zoology. By HENRY ALLEYNE NICHOLSON, MD, D.Sc., FLS, FGS, Regius Professor of Natural History in the University of Aberdeen.
Page 589 - THE ANCIENT LIFE-HISTORY OF THE EARTH. A Comprehensive Outline of the Principles and Leading Facts of Palojontologieal Science. 12mo. Cloth, $2.00. " A work by a master in the science who understands the significance of every phenomenon which he records, and knows how to make it reveal its lessons.
Page 494 - ... equal, the correlatives of a more complex brain ; as are also those more numerous, more varied, more general, and more abstract ideas, which must also become increasingly requisite for successful life as society advances. And the genesis of this larger quantity of feeling and thought in a brain thus augmented in size and developed in structure, is, other things equal, the correlative of a greater wear of nervous tissue and greater consumption of materials to repair it. So that both in original...
Page 587 - The result is the appearance of a collection of facts which will be a real boon to the student of Comparative Psychology, for this is the first attempt to present systematically well-assured observations on the mental life of animals.
Page 512 - autogenous' elements. The italics denote the parts, more properly called processes, which shoot out as continuations from some of the preceding elements, and are termed 'exogenous': eg the diapophyses or upper 'transverse processes,' and the zygapophyses, or the ' oblique ' or ' articular processes
Page 135 - How far such differences are due to the positions of the parts in the bud ; how far the respective spaces available for the parts when unfolded affect them ; and how far the parts are rendered unlike by unlikenesses in their relations to light, it is difficult to say. Probably, these several factors operate in all varieties of proportion.
Page 428 - It is a general physiological truth that while the buildingup of the individual is going on rapidly, the reproductive organs remain imperfectly developed and inactive; and that the commencement of reproduction at once indicates a declining rate of growth, and becomes a cause of arresting growth.
Page 498 - It produced the original diffusion of the race. It compelled men to abandon predatory habits and take to agriculture. It led to the clearing of the Earth's surface. It forced men into the social state ; made social organization inevitable ; and has developed the social sentiments. It has stimulated to progressive improvements in production, and to increased skill and intelligence.