Hoi. land: |oiin J'.k.i.i. Haichkk. 



GOl 



in relation to this subject, which had been opposed by almost every 

 other geologist in America, were finally ascertained to be correct, 

 and it was a matter of great personal gratification to him, as the 

 writer of these lines knows, that the accuracy of his observations 

 and of his conclusions, which had been reached many years before, 

 had been verified. 



While professor Hatcher wrote very little in relation to geology, 

 he nevertheless was regarded as being one of the very ablest of 

 American geologists, his great experience in the field and his close 

 attention to the subject having given him a practical knowledge of 

 the subject, such as was possessed by few of his contemporaries. 

 One of the leading geologists in America, in speaking of him said 

 to the writer, " I regard Professor Hatcher as one of the best 

 informed geologists in the United States. He is preeminent in this 

 field, though he sets comparatively small store by his attainments." 



The last five years of his life, during which he was connected 

 with the Carnegie Institute, were not only years in which he proved 

 himself remarkably successful as a collector, but in which he revealed 

 his ability as a scientific author. A number of important papers 

 from his pen have appeared in the Annals and Memoirs of the Car- 

 negie Museum. The first volume of the Reports of the Princeton 

 University Expeditions was written by him during this time. He 

 contributed numerous brief articles to various scientific journals, 

 and in 1902 undertook for the United States Geological Survey the 

 completion of the Monograph of the Ceratopsia which had been left 

 unfinished by Professor Marsh at the time of his death. The writer 

 believes that this great work had been brought so far that it will be 

 jiossible to complete it with comj^aratively small effort on the part 

 of some one reasonably familiar with the subject. Various other 

 important papers of a monographic character had been begun. 

 Unfortunately these for the most part are not in such condition that 

 they can be published. 



One of the great undertakings which had occupied much of his 

 time and thought during the past eighteen months was the reproduc- 

 tion of the skeleton of Diplodocus carnegii, a restoration of which 

 had been ordered by Mr. Andrew Carnegie for the purpose of pre- 

 senting the same to the British Museum of Natural History, the 

 Trustees of which in February, 1903, had formally signified their 



