246 A CENTURY OF SCIENCE 



phyla, and of the proboscideans, which while having their 

 pristine home in the Old World nevertheless soon sought 

 the new where their remains are found from the Miocene 

 until their final and apparently very recent extinction. 

 These creatures show increase of bulk, perfection of feet 

 and teeth, development of various weapons, horns and 

 antlers, which may be studied in their relationship with 

 the other organs to make the evolving whole, or their 

 evolution may be traced as individual structures which 

 have their rise, culmination, and sometimes their senile 

 atrophy in a way comparable to that of the representa- 

 tives of the order as a whole. Thus, for example, 

 Osborn has traced the evolution of the molar teeth, and 

 Cope of the feet, while Marsh has shown that brain devel- 

 opment runs a similar course and that its degree of per- 

 fection within a group is a potent factor for survival. 

 As a student of evolution, the paleontologist sees 

 things in a very different light from the zoologist. The 

 latter is concerned largely with matters of detail with 

 the inheritance of color or of the minor and more super- 

 ficial characteristics of animals and the period of 

 observation of such phenomena is of necessity brief 

 because of the mortality of the observer. Whereas the 

 paleontologist has a perspective which the other lacks, 

 since for him time means little in the terms of his own 

 life, and he can look into the past and see the great and 

 fundamental changes which evolution has wrought, the 

 rise of phyla, of classes, of orders, and he alone can see 

 the orderliness of the process and sense the majesty of 

 the laws which govern it. 



Influence of the American Journal of Science. 



The influence of the American Journal of Science as a 

 medium for the dissemination of the results of vertebrate 

 research has been in evidence throughout this discussion, 

 but it were well, perhaps, to emphasize that service more 

 fully. The Journal was, as we have seen, the chief outlet 

 for Professor Marsh's research, for there were published 

 in it during his lifetime no fewer than 175 papers descrip- 

 tive of the forms which he studied, as well as a great part 

 of the material in the published monographs. As Marsh 



