. The origin and evolution of life, on the theory of action, reaction and interaction of energy. contrasted with the Amxha. many of the flagellates have definite, characteristic bodyforms, and have the function of food ingestion limited to a special area of the body. Magnified 285 timeslife-size. Photographed from a model in the .\merican Museum. E. A typical ciliate, one of the most highly organized single-celled forms, distinguished by a multitude of fine hair-like cilia, distributed over the whole or a part of the body, which are used for locomotion and forthe capture of food. In some forms
. The origin and evolution of life, on the theory of action, reaction and interaction of energy. contrasted with the Amxha. many of the flagellates have definite, characteristic bodyforms, and have the function of food ingestion limited to a special area of the body. Magnified 285 timeslife-size. Photographed from a model in the .\merican Museum. E. A typical ciliate, one of the most highly organized single-celled forms, distinguished by a multitude of fine hair-like cilia, distributed over the whole or a part of the body, which are used for locomotion and forthe capture of food. In some forms these cilia are grouped or specialized for further effectiveness. AfterBUtschli Magnified 180 times life-size. EVOLUTION OF PROTOZOA 113 neighborhood of a wave-length of 477 /iyu, and (2) in theyellowish-green, in the region of X = 534 /u/a; and these twowave-lengths affect different organisms, with no very evidentrelation to the nature of these latter. Thus the blue rays(of 477 ixfx) attract the protozoan flagellate Euglena, the hydroid HEAT Billion ■vibraiijlds per second-i^^^ CHEMICAL. ULTRA VIOLET Fig. 17. Light, Heat, and Chemical Influence of the Sun. Diagram showing the increase, maximum, and decrease of heat, light, and chemicalenergy derived from the sun. The shaded area represents that portion of the spec-trum included in the phosphorescent light emitted by our common fire-flies. It isprobable that it corresponds more closely with the light sensitiveness of the fire-flyseye than with that of the human eye as represented by the wave marked Ulric Dahlgren. coelenterate Eudendrium, and the seedlings of oats; while theyellowish-green rays (of 534 /x^i) in turn affect the protozoanChlamydomonas, the crustacean Daphnia, and the crustaceanlarvae of barnacles. Aside from these heliotropic movements which they sharewith plants, animals show higher powers of individuality, ofinitiation, of experiment, and of what Jennings cautiouslyterms a conscious aspect of beh
Size: 2105px × 1187px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkcscribnerss
