. The origin and evolution of life, on the theory of action, reaction and interaction of energy. ts to thoroughly pro-tect the organism. It develops throughmodified body tissues in the form ofsuperimposed plates (electroplaxes) se-parated equally from one another bylayers of a peculiar jelly-like connec-tive tissue, all lying parallel to eachother and at right angles to the direc-tion of discharge.^ The electric organis formed from modified muscle andconnective tissue and is innervated bymotor nerves. The physical principleinvolved is that of the concentrationcell, and the electrolyte used in
. The origin and evolution of life, on the theory of action, reaction and interaction of energy. ts to thoroughly pro-tect the organism. It develops throughmodified body tissues in the form ofsuperimposed plates (electroplaxes) se-parated equally from one another bylayers of a peculiar jelly-like connec-tive tissue, all lying parallel to eachother and at right angles to the direc-tion of discharge.^ The electric organis formed from modified muscle andconnective tissue and is innervated bymotor nerves. The physical principleinvolved is that of the concentrationcell, and the electrolyte used in theprocess is probably sodium theory is that at the moment ofdischarge a membrane is formed on onesurface of the electroplax which prevents the negative ionsfrom passing through while the positive ions do pass throughand form the current. The strength of the current variesfrom four volts in Mormyriis up to as much as 250 or morein Gymnotus, the electric eel, and consists of a series of shocksdischarged 3/1000 of a second apart. 1 Dahlgren, Ulric, iqo6, pp. 389-398; 1910, p. Fig. 57. The EarliestKnown Limbed of Tliinopus anli-qiius Marsh, an amphibianfrom the Upper Devonian ofPennsylvania. Type in thePeabody Museum of YaleUniversity. Photograph ofcast presented to the Ameri-can Museum of Natural His-tory by the PeabodyMuseum. EVOLUTION OF THE AMPHIBIANS 177 %i:.-\
Size: 1230px × 2031px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkcscribnerss
