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father's death, though the first letter I can find from Mr. Lesquereux is 

 dated March i, 1857, and begins: 



*' I thought of proposing you to go together to the White Mts. next 

 summer, but being engaged in the Geological Survey of Kentucky I shall 

 scarcely find time for a journey to the mountains. I w.ould be delighted to 

 have your company but perhaps you would decline to go with me. I am 

 entirely deaf. The only way I could have given you some compensation for 

 the trouble of travelling with me is by my intimate acquaintance with the 

 alpine mountains and their botanical riches. Many and many a time I have 

 travelled over the Alps, the Jura, the Vosges, in France and Switzerland 

 with Schimper, Mougeot, and other excellent friends and bryologists. If 

 you were not afraid of my company I would try and meet you somewhere, 

 perhaps in August this year. 



I have. pretty well explored the northern part of Pennsylvania during 

 two years that I was engaged in the geological Survey of the coal basin. 

 There are some very good places around Mauch-Chunk, and also on the 

 high waters of the Juniata River." 



From this it will be seen that they had not met; my father eagerly 

 accepted the offer of his company, and after describing the proposed excur- 

 sion added, " I do hope this arrangement will comport with your conveni- 

 ence, and that you, Mr. Sullivant, and perhaps Prof. Porter, of Lancaster, 

 will make the party. Prof. Porter in a letter recently informed me that you 

 were to make him a visit, so bring him along, and if we can get some of the 

 Yankees to fall in we will have a very pleasant and instructive tour." I do 

 not know if Mr. Lesquereux went ; he wrote that Mr. Sullivant, though 

 a close student at the cabinet, did not go out collecting. Either at this time 

 or soon after the authors of the Manual of Mosses did meet and became close 

 friends. I think they never had a discussion or difference 



In 1871 he published another catalogue of mosses in Volume V, of the 

 Clarence King Surveys. And in the spring of 1873 he lost his dear old friend. 

 Dr. Torrey, and his correspondent, Sullivant. It was then that Dr. Gray 

 came to my father and told him that there was no one but him to bring out 

 the Synopsis of North American Mosses with Mr. Lesquereux. At first my 

 father refused, saying he could not do it, but Dr. Gray would not take no for 

 an answer, and at last my father consented. Once having made up his 

 mind that it was his duty to do this work he went at it with the energy of 

 youth. His colleague not being able to use the microscope it fell to him to 

 make the examinations and comparisons and to draw almost constantly, 

 looking through the microscope and then at his drawing. In 1878 he pub- 

 lished another catalogue of Western Mosses, in Vol. VI of the Wheeler Sur- 

 veys. By this time the steady application was beginning to tell on his 

 health, and the physician recommended rest. He also felt the need of con- 

 sulting Schimper. the best European Bryologist, who, in 1862, had become 

 Professor of Geology and Minerology at the University of Strassburg. So 

 in April, 1878. my mother and I sailed with him for England. We were 

 gone five months, and the whole journey was a delight to him. In London 



