SKETCH OF 1844. 375 



treated in the Sketch with ' Variation under Nature ' in the 

 first part. 



The following list of the chapters of the second part of the 

 Sketch will illustrate their correspondence with the final 

 chapters of the * Origin.' 



Chapter I. " On the kind of intermediateness necessary, 

 and the number of such intermediate forms." 



This includes a geological discussion, and corresponds to 

 parts of Chapters VI. and IX. of the * Origin.* 



Chapter II. ** The gradual appearance and disappearance 

 of organic beings." Corresponds to Chapter X. of the 

 ' Origin.' 



Chapter III. " Geographical Distribution/' Corresponds 

 to Chapters XI. and XII. of the ' Origin.' 



Chapter IV. "Affinities and Classification of Organic 

 beings." 



Chapter V. "Unity of Type," Morphology, Embryology. 



Chapter VI. Rudimentary Organs. 



These three chapters correspond to Chapter XII. of the 

 'Origin.' 



Chapter VII. Recapitulation and Conclusion. The final 

 sentence of the Sketch, which we saw in its first rough form 

 in the Note Book of 1837, closely resembles the final sentence 

 of the ' Origin,* much of it being identical. The ' Origin ' is 

 not divided into two " Parts," but we see traces of such a 

 division having been present in the writer's mind, in this re- 

 semblance between the second part of the Sketch and the 

 final chapters of the 'Origin.' That he should speak * of the 

 chapters on transition, on instinct, on hybridism, and on the 

 geological record, as forming a group, may be due to the di- 

 vision of his early MS. into two parts. 



Mr. Huxley, who was good enough to read the Sketch at 

 my request, while remarking that the " main lines of argu- 

 ment," and the illustrations employed are the same, points 

 out that in the 1844 Essay, "much more weight is attached 



* * Origin,' Introduction, p. 5. 



