The American Naturalist, Volume 52Essex Institute, 1918 - Biology |
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Common terms and phrases
aleurone algæ allelomorphs Andalusian animals appear Apterous awns bacteria Barred Plymouth Rocks Biological birds blue-splashed breeding cells cent characters chromosome color Colorless coral cotyledons cross cross-over ratio curve Cynips Drosophila evidence evolution exchange ratios F₁ F₂ fact factor mutations fantail Fantail Pigeon females fish flock forked forms gall gambeli gametes gene genera genetic green hatched Hawaiian heredity heterozygous homozygous hybrids individuals inheritance Insect Lake Clear larvæ length male Mendelian mice moult normal number of eggs oats occur offspring organism pair parent parthenogenetic phase pigment Pima plants Plymouth Rocks present probably progenies pubescence pullets races records reefs relation Rhode Island Reds rubidus Schlechtendalia Science seed-coat sexual sexual reproduction Shorter Articles shown sonoriensis species T. H. Morgan temperature theory tion tissues variability variations whitefish winter egg production yellow zygote
Popular passages
Page 480 - It is seldom, if ever, between a consequent and a single antecedent that this invariable sequence subsists. It is usually between a consequent and the sum of several antecedents; the concurrence of all of them being requisite to produce, that is, to be certain of being followed by the consequent.
Page 560 - Genetic Relations of the Winged and Wingless Forms to Each Other and to the Sexes in the Aphid Microsiphum Solanifolii,
Page 464 - An illustrated magazine, established in 1872, devoted to the diffusion of science, publishing articles by leading authorities in all departments of pure and applied science, including the applications of science to education and society. Annual subscription...
Page 470 - Surely in meteorology, as in astronomy, the thing to hunt down is a cycle, and if that is not to be found in the temperate zone, then go to the frigid zones, or the torrid zones and look for it, and if found, then above all things, and in whatever manner, lay hold of, study it, record it, and see what it means.
Page 484 - As the components of a system there are to be chosen the smallest number of independently variable constituents by means of which the composition of each phase participating in the state of equilibrium can be expressed in the form of a chemical equation.
Page 464 - A weekly journal, which began publication on January 2, 1915, covering the field of education in relation to the problems of American democracy. Its objects are the advancement of education as a science and the adjustment of our lower and higher schools to the needs of modem life.
Page 64 - BOLUS HERBARIUM CAMBRIDGE UNIVERSITY PRESS The journal is mainly concerned with botanical work inspired by Dr. Bolus and with investigations conducted in connection with the Bolus Herbarium at Capetown and contributing to our knowledge of the vegetation of South Africa. It also gives especial attention to material designed to aid the teaching of botany in the schools. Subscription price, $3.75 a volume. Single parts, $1.25.
Page 469 - ... and a variety of other physiographic products. An organism is also an agent which expends physical and chemical energy, producing stress and exerting pressure and expending energy on other substances, exhibits its process of response or its process of behavior. An animal, by the process of predation runs down another animal and devours it, by its process of digestion dissolves it, and by the process of assimilation makes muscle, bone, feathers or fur out of it, and these are all products of its...
Page 479 - When the magnitude of a function is limited by one of a set of possible factors, increase of that factor, and of that one, alone, will be found to bring about an increase of the magnitude of the function . . . (p.
Page 484 - In deciding the number of components in any given system, not only must the constituents chosen be capable of independent variation, but a further restriction is imposed, and we obtain the following rule : As the components of a system there are to...