Design in Nature: Illustrated by Spiral and Other Arrangements in the Inorganic and Organic Kingdoms as Exemplified in Matter, Force, Life, Growth, Rhythms, &c., Especially in Crystals, Plants, and Animals, Volume 3Longman, Green, and Company, 1908 - 1416 pagine |
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Parole e frasi comuni
action angles arrangement backwards Berjeau bipeds bird body bones caudal caudal fin comparatively concave descends described diagonal direction dissections dorsal double curve effective stroke elastic elbow-joint elevated elytra extension and flexion extinct feet figure figure-of-8 figure-of-8 movements fish flexed flexion flight flippers flying forearm gannet ground hind legs horizontal horse humerus Ichthyosaurus iguanodon insect joints kite left fore left hind left leg leg and foot lever ligaments limbs locomotion long axis mammals membrane motion move muscles muscular system Museum nature oblique oscillate pectoral fins Pettigrew pinion plane plants and animals plaster-of-Paris Plate plesiosaurus portion posterior extremities posterior margin primary Professor Marey propeller pterodactyls quadrupeds remarkable reptiles resemble reverse right fore right hind root rotation screw sea-lion secondary feathers seen shoulder shoulder-joint speed spiral stroke structures surface swimming tail trunk twisting ulna ventral vertebral column vertical vibrate walking weight wing
Brani popolari
Pagina 1204 - ... non. In order to utilize the air as a means of transit, the body in motion, whether it moves in virtue of the life it possesses, or because of a force superadded, must bo heavier than it.
Pagina 1065 - DESIGN IN NATURE: Illustrated by Spiral and other Arrangements in the Inorganic and Organic Kingdoms as exemplified in Matter, Force, Life, Growth, Rhythms, etc., especially in Crystals, Plants, and Animals. With Examples selected from the Reproductive, Alimentary, Respiratory, Circulatory, Nervous, Muscular, Osseous, Locomotory, and other Systems of Animals. By J. BELL PETTIGREW, MD, LL.D., FRS...
Pagina 1379 - ANIMAL MECHANISM. A Treatise on Terrestrial and Aerial Locomotion. By EJ MAREY. With 117 Illustrations. Price, $1.75. No. 12. THE HISTORY OF THE CONFLICT BETWEEN RELIGION AND SCIENCE. By JOHN WM. DRAPER, MD, LL. D., author of " The Intellectual Development of Europe.
Pagina 1225 - This twisting is in a great measure owing to the manner in which the bones of the wing are twisted upon themselves, and the spiral nature of their articular surfaces, the long axes of the joints always intersecting each other at right angles. As a result of this disposition of the articular surfaces the wing may...
Pagina 1385 - ... the following figures: From these measurements, in spite of variations in detail, the evident result is obtained, that animals of large size and great weight sustain themselves with a much smaller proportional alar surface than smaller animals. A similar result already shows that the office of the wing in flight is not merely passive, for a sail or parachute should always have a surface proportioned to the weight which acts upon it ; considered, on the contrary, from its true point of view, that...
Pagina 1116 - ... projection; and the anterior bends being stretched in a straight line, the front part of the body is propelled in consequence. During this peculiar kind of locomotion the numerous broad shields of the belly are of great advantage, as by means of the free edges of those shields they are enabled to catch the smallest projections of the ground which may be used as points of support.
Pagina 1091 - Every body continues in a state of rest, or of uniform motion in a straight line, except in so far as it may be compelled by impressed forces to change that state.
Pagina 1266 - The stability in this position, arising from the centre of gravity being below the point of suspension, is aided by a remarkable circumstance, that experiment alone could point out. In very acute angles with the current it appears, that the centre of resistance in the sail does not coincide with the centre of its surface, but is considerably in front of it.
Pagina 1347 - If I was right in calculating that the present delta of the Mississippi has required, as a minimum of time, more than one hundred thousand years for its growth,* it would follow, if the claims of the Natchez man to have coexisted with the mastodon are admitted, that North America was peopled more than a thousand centuries ago by the human race.
Pagina 1348 - ... are older than the valley drifts, I do not see how we are to avoid the conclusion, that not only was the plateau race not contemporary with the valley men, but also that the former belonged to a period considerably anterior to the latter — either an early glacial or a pre-glacial period.