The common frog . I\/ Apa. dcL cuL br3 Fic;. 82 — The Circulation of a Tadpole in its pr mitive stage, when nearly all theblood is distributed to the gills ; the pulmonary arteries being quite rudimentary,and the vessel (or ductus botali) connecting together the branchial artery andvein at the root of each gill being minute, a, bulbus aortse ; b, branchial arteries ;br^. br^, br^, the three gills (or branchiae of each side); bii, the branchial veinswhich bring back the blood from the gills—the hindermost pair of branchial veinson each side unite to form an aortic arch {na), which again unites

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The common frog . I\/ Apa. dcL cuL br3 Fic;. 82 — The Circulation of a Tadpole in its pr mitive stage, when nearly all theblood is distributed to the gills ; the pulmonary arteries being quite rudimentary,and the vessel (or ductus botali) connecting together the branchial artery andvein at the root of each gill being minute, a, bulbus aortse ; b, branchial arteries ;br^. br^, br^, the three gills (or branchiae of each side); bii, the branchial veinswhich bring back the blood from the gills—the hindermost pair of branchial veinson each side unite to form an aortic arch {na), which again unites with its fellowof the opposite side to form da, the descending (or dorsal) aorta. The branchialveins of the foremost gills give rise to the carotid arteries cc; o, artery goingto the orbit ;/rt, pulmonary artery: 1, 2, 3, anastomosing branches connectinglogether the adjacent branchialarteries and

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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1874