PREFACE 



When the Amherst Expedition to Patagonia had proved 

 successful, the question arose as to the best manner of pre- 

 senting its results to the two groups of people who are 

 naturally interested ; the alumni and public whose interest 

 is primarily in the general features of the country and in 

 the broad summary of conclusions, and to the smaller num- 

 ber who are interested in the technical details of the struc- 

 ture, relations and origins of the animals the bones of which 

 were found. This volume is written for the former class, 

 and omits the details and discussions of the arguments for 

 one or the other position. 



The preparation of the fossils which were found is pro- 

 gressing rapidly and will be complete at an early date, 

 after which a detailed study of these will be made and 

 those descriptions and results will appear next year in a 

 separate and independent volume. 



F. B. LooMis. 



March i, 1913. 



