File:Journal of experimental zoology (1904) (14764781972).jpg

Identifier: journalofexperim26broo (find matches)
Title: Journal of experimental zoology
Year: 1904 (1900s)
Authors: Brooks, William Keith, 1848-1908 Wistar Institute of Anatomy and Biology
Subjects: Zoology
Publisher: Philadelphia Wistar Institute of Anatomy and Biology
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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329 PLATE 4 EXPLANATION OP FIGURES Fi<2;. 10 Blood from ;in exritcd horned toad was injected subcutaneously intothis animal at the point indicated hy the arrow, ihe skin has become clearlypaler around the point of injection. X 1. Fig. 11 At the point indicated l)y the arj-ow, 0.2 cc. of a solution of one part ofadrenalin chloride in 10,000,000 parts of 0.75 per cent NaCl was injected under theskin of the horned toad. The skin has become paler at this point, producing aneffect identical with that obtained by injecting blood from an excited horned toadinto the animal shown in figure 10. XI. Fig. 12 Into the horned toad on the left was injected 0.2 cc. of a solution of onepart of adrenalin chloride in 100,000 parts of 0.75 per cent NaCl. The pale colora-tion produced by this means may be contrasted with the usual coloration illus-trated by the animal on the right. X 1. 330 MELANOPHORES OF THE HORNED TOAD ALFRED C. REDFIELD PLATE 4
Text Appearing After Image:
331 PLATE 5 EXPLAXATION OF FIGURES Fig. 13 The adrenal glands of this horned toad were stimulated with a weakfaradic current. The mclanophore pigment of the entire skin, with the exceptionof that of the right hind leg, from which adrenin has been excluded b) a ligature,has been contracted. Compare with figure 8, in which a similar effect has beenproduced by excitement. X 1. Fig. 14 The left sciatic nerve of this horned toad was stimulated at the pointindicated by the threads, close to the trunk. As a result the left hind leg is slight-ly paler than the right. Note particularly the pale patch on the thigh indicatedby the arrow. X 1. Fig. 15 Cutting the spinal cord of this horned toad has caused the posteriorhalf of the skin to remain dark while the anterior half has assumed a pale colora-tion. The dividing line between the dark and pale areas is indicated byarrows. XI. Fig. 16 An effect, similar to that illustrated in figure 15, which was producedin this horned toad only when, in addit

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