SUMMARY. 35 



originally heterogeneous cells, not of homogeneous cells transmuted 

 by an alleged process of * differentiation^ p. 45. The blastoderma in 

 the various metamorphoses it undergoes towards the development 

 of the embryo, considered by itself, resembles lower forms of organ- 

 isation, p. 48. The embryonic development of man similar to that 

 of other mammifera^ but this fact is no proof that man was evolved 

 from lower mammifera, p. 51. Nor is the fact of the resemblance 

 of the embryo of mammifera to that of lower vertebrate, any 

 evidence of the evolution of a mammal from a frog or fish, p. 52. 

 Equally little is the resemblance which may be traced between ver- 

 tebrata and invertebrata any evidence that the lancelet, for example, 

 was evolved from an ascidian mollusk, p. 57. Comparison of the 

 plan of organisation of a lobster and that of a vertebrate animal, p. 53. 

 The difference not so great between them, if we recognise that what 

 is commonly considered the ventral aspect of the body of the lobster 

 is really homologous with, or corresponds to, the vertebral or dor- 

 sal aspect of a vertebrate animal, p. 53. Unfounded nature of the 

 alleged near relationship between an ascidian mollusk and the am- 

 phioxus or lancelet, by evolution of the latter from the former, p. 56. 

 The structure in the tail of the ascidian larva, supposed to be the 

 homologue of the cor da dorsalis of the vertebrate embryo, denied 

 to have any such signification, p. 56. The vertebrate ancestral forms 

 through which Haeckel hypothetically alleges the human race to 

 have been successively evolved were : the amphioxus or lancelet 

 tribe of fishes ; lampreys ; fishes of the shark tribe j fishes like the 

 lepido-siren ; perennibranchiate batrachiaris, like the proteus and 

 axolotl ; salamanders ; lizard-like creatures ; monotremata, or' 

 animals like the ornithorhyncus ; marsupialia, or animals like the 

 kangaroo rat ; half apes, like the lemur j tailed apes j tail-less 

 or men-apes, like the orang ; speechless~ape-men, p. 60. In this 

 series of hypothetical animal forms transitional resemblances may 

 be traced or assumed ; but this constitutes no evidence in favour 

 of the doctrine of Evolution, p. 68. Evolution, in short, from be- 

 ginning to end is an hypothesis unverified and unverifiable^ p. 68. 



LADIES and GENTLEMEN, In the Lecture on 

 Evolution, which I delivered in this theatre on the 

 2 Qth of October last year, I examined only the more 

 general and prominent points . of the doctrine, as 



D 2 



