IV PREFACE. 



the cause of Correlation of Growth ; and of the causes of 

 others of his many colligations of facts, Darwin asserts that 

 he is "in profound ignorance." Their explanation, in this 

 work, however, puts a wholly different phase upon the prob- 

 lem of development, from that which Darwin (by merely 

 estimating the ratio of development of seemingly inexplicable 

 variations) has given it ; and, further, demonstratively proves 

 that species are normally immutable ; that there is, for each 

 species, a physiologically perfect type (capable of being real- 

 ized by careful selection) ; and that this type, although it is 

 susceptible of modification, in countless ways, is or may be 

 modified, only at the cost of evil results which soon lead to the 

 sterility, lessened constitutional vigor, and consequent extinc- 

 tion, of the line of those individuals which have so departed 

 from the true moulds of their respective species. 



These conclusions are arrived at, simply by making a 

 slightly different apportionment of Darwin's facts, under Dar- 

 win's principles. 



Mr. Darwin has a body of facts, and a certain set of scientific 

 factors. These facts he distributes under his several factors, 

 conformably to a system of apportionment which leaves a re- 

 siduum which, in default of ability to explain, he is unwillingly 

 constrained to refer to such confessedly illegitimate factors, or 

 entities, as, " an innate tendency," " spontaneous variability," 

 " the nature and constitution of the being which varies," 

 " some great law of nature," etc. 



In this Refutation and Converse Theory, all of Darwin's 

 facts are taken for granted, as are all of his scientific factors. 

 These same facts, however, are differently apportioned, with 

 but a slight variation from Darwin's mode of distribution of 

 them ; and they are relegated to the same set of factors, in 



