justly famous for his encyclopedic knowl- 

 edge of all the vertebrates. 



These three quite naturally developed 

 different approaches to their evolutionary 

 studies. Osbom was by training a biolo- 

 gist, so his interpretation of the evolution 

 of extinct animals was dominated by his 

 knowledge of related modem animals. In 

 contrast, Matthew's view of evolution, 

 particularly mammalian evolution, was 

 based upon his broad background in geol- 

 ogy and especially stratigraphy — the se- 

 quence of rock strata in which fossils are 

 found. (Matthew's father, George Frederic 

 Matthew, was a distinguished Canadian 

 geologist, and young Matthew became 

 further steeped in geology under another 

 Columbia mentor, James Furman Kemp.) 

 Gregory was primarily a comparative 

 anatomist who extended his comparisons 

 to vertebrates of all geologic ages. His 

 scholarship was indeed comprehensive, 

 for his view of the world reached across 

 time, space, and phytogeny. 



The three men— Osbom, Matthew, and 

 Gregory-— brought to the enormously 

 complex subject of vertebrate evolution a 

 powerful combination of different talents 

 and outlooks that helped shape the disci- 

 pline for decades to come. 



They worked both separately and to- 

 gether, and their collaborative studies de- 

 scribing previously unknown fossil spe- 

 cies led to the revelation of many new 

 evolutionary facts. Important assemblages 

 of extinct creatures were worked up for 

 publication under the joint authorships of 

 Osbom and Matthew, Osbom and Gre- 

 gory, and Matthew and Gregory. As for 

 their individual interpretations of evolu- 

 tionary processes, most of those papers 

 were signed singly because of their sepa- 

 rate and sometimes divergent opinions. 



Osbom, a large and forceful man, liked 

 to formulate evolutionary "laws" to which 

 he appended his own designations. Per- 



-V n 



Where the foii'St 



iS:awildprofitsioiu)fpkmts, 



.■.. AViiit(m'efm^' trees '- 



m shades afpihi on green 



Tliisls Costa Rka. 

 ■'■ Nature that captimtes"- 

 ■ - '_ ' yom semes. 

 ■ Nairn's Musami 



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