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Annals of the Carnegie Museum. 



stand in the way of what he conceived to be his calling. From 

 the summer of 1884 until the year 1893 he was continuously in the 

 employment of Professor Marsh. During these years he conducted 

 explorations sometimes alone, sometimes accompanied by others, 

 over a wide area in the States of Nebraska, the Dakotas, Montana, 

 Utah, Wyoming; and Colorado. These expeditions to the western 

 country, which usually began early in the spring, continued until 

 late in the fall, or even into the early winter. He also collected 

 in the winter months and early spring in Maryland, and North 

 Carolina. His success as a collector was phenomenal, and the 

 scientific treasures which he unearthed greatly enriched the col- 

 lections of the United States Geological Survey and of the Pea- 

 body Museum in New Haven. It was upon the collections of ver- 

 tebrate fossils made by Mr. Hatcher that Professor Othniel C. 

 Marsh based to a very large extent many of his most important 

 papers, and to Mr. Hatcher more than to any other man is due the 

 discovery and collection of the Ceratopsia, perhaps the most strik- 

 ing of all the extinct reptilia. Very little had been known about 

 them, and before Hatcher succeeded in discovering a large number 

 of skulls and skeletons they were at best represented by a few 

 fragments, the nature of which was hardly understood even by the 

 most advanced students. At the time of his lamented death Prof. 

 Marsh was engaged in preparing a monograph upon this material, 

 and it fell to his distinguished student, who had discovered these 

 colossal creatures, to take up in 1902 the work which Professor 

 Marsh had left unfinished, and it was to this work that he was 

 devoting himself when the hand of death cut him off, as it had 

 some years before removed his revered and distinguished master. 



In 1890 Mr. Hatcher was made Assistant to the chair of Geology 

 in Yale University. In 1893 he was elected Curator of Vertebrate 

 Paleontology and Assistant to the chair of Geology in the College 

 of New Jersey at Princeton. 



While at Princeton he continued his geological and paleonto- 

 logical explorations in the Western States with his usual enthusiasm 

 and success. For many years he had cherished the wish to under- 

 take the exploration from a geological and paleontological stand- 

 point of Patagonia and Terra del Fuego. He finally undertook 

 the collection of a fund to enable him to carry out his purpose. 



