ANTIQUITY OF THE HUMAN RACE 203 



even a single instance. 1 Delange, as we have 

 sufficiently shown, makes the same admission. 2 

 Kellogg says as much. 3 The same testimony is 

 given by Quatrefages, Virchow, Wiegand, Muller, 

 Du Bois-Reymond and many others. 4 Indeed 

 there is nothing else for any scientist to say. In 

 place of an endless chain of connected species, 

 we have loose rings, as it were, isolated species, 

 with all the links between them "missing." It 

 was this very impossibility of proving the transi- 

 tion from any one species to another that helped 

 to popularize the saltatory theory, which call? 

 for no missing links, but lets the species appear 

 suddenly, fully formed, as we actually find them 

 in our geological and paleontological researches. 

 But here again there can be no certainty except 

 upon the assumption of a private revelation. 



Now the Church has always been exceedingly 

 guarded in the matter of private revelations, and 

 indeed of all revelations made since the days of 

 the Apostles. In no case and under no circum- 

 stances does she ever demand an act of faith in 

 them. Even the Catholic Faith itself, we repeat 

 here, is never to be accepted by anyone until that 

 person has been fully convinced by reasons of 

 credibility such as intellectually make its accept- 

 ance imperative. If therefore the Princeton fao 



1 See Chapter III of this volume. 



'Chapter I. 



1 Chapter III. 



4 See America, Feb. 28, 1914, p. 487- 



