Evolution; its nature, its evidences, and its relation to religious thought . a fish; b, one arch with fringe(after Owen); h, the heart. course, necessary, for they are the gill-arches. Thewhole of the blood passes through tliese arches, to beaerated in the gill-fringes. The use of this peculiarstructure is here obvious enough. If a lizard were evera fish, and afterward turned into a lizard, changing itsgill-respiration for lung-respiration, then, of course, theuseless gill-arches would remain to tell the story. Now,although a lizard never was a fish, in its individual his-tory or ontogeny, it
Evolution; its nature, its evidences, and its relation to religious thought . a fish; b, one arch with fringe(after Owen); h, the heart. course, necessary, for they are the gill-arches. Thewhole of the blood passes through tliese arches, to beaerated in the gill-fringes. The use of this peculiarstructure is here obvious enough. If a lizard were evera fish, and afterward turned into a lizard, changing itsgill-respiration for lung-respiration, then, of course, theuseless gill-arches would remain to tell the story. Now,although a lizard never was a fish, in its individual his-tory or ontogeny, it was a fish in its family history orphylogeny, and therefore it yet retains, by heredity, thiscurious and useless structure as evidence of its this is the true explanation is demonstrated by the fact that in amphibians this very change actually12 151 EVIDENCES OF THE TRUTH OF EVOLUTION. takes place before our eyes in the individual history. Wehave already seen that the individual frog, in its tadpolestate, is a gill-breather. It has therefore its gill-arches. Fig. 38, 39.—Diagrams showing- the ^e of the course of blood inthedevelopment of a frog. 38. The tadpole stage.^ 39. The maturecondition, h, heart; ogg, external gills; t^^y, internal gills;c c, connecting branches in the tadpole ; pp, pulmonary branches. PROOFS FROM EMBRYOLOGY. 155 (Fig. 38), three on each side, like a fish, and for the samereason, viz., the aeration of the blood. But when its gillsdry up and lung-respiration is established, its now uselessgill-arches still remain as aortic arches, to attest theirprevious condition (Fig. 39). Now, the lizard undoubt-edly came from an air-breathing, tailed amphibian, andtherefore inherited this form of arterial distribution. Inboth lizard and amphibian the ultimate cause is an originfrom fishes, in which such arches are obviously diagrams. Figs. 38 and 39, are illustrations some-what idealized, showing the manner in which the ch
Size: 1382px × 1807px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectreligion, bookyear192
