Introductory course of natural philosophy for the use of schools and academies. Ed. from Ganot's popular physics. By William G. Peck (1869)
Ganot, Adolphe, 1804-1887, Peck, William Guy, 1820-1892 · New York A.S. Barnes · leaf 98
ming Bladder of Fishes. 91. In many fishes there is a bladder filled with air,situated directly under the backbone. This is called theSwimming Bladder. When the fish wishes to descend, it compresses this bladder by amuscular effort, and then, as the quantity of water displaced is lessthan before,… … Fig. 61. Swimming. 92. The human body is lighter than water, especially than thesalt water of the ocean, and tends naturally to float when immersed.The only reason why men do not swim naturally, is the difficultyof keeping the head out of water, so as to be able to breathe. Thehead is the heaviest…
Physics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
