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by seeing him grow into such a broad and discriminating knowledge of lichens 

 that I was glad to send to him my whole collections of genera which he was 

 studying for publication. Also his nearness to the Tuckerman herbarium at 

 Harvard made it possible for him to aid me greatly by comparing some of my 

 doubtful specimens there. The letters which I have retained through the years 

 bear evidence of a most cordial friendship, and I was very anxious when I learned 

 of the serious illness of my friend and co-worker and was greatly depressed when 

 ■word came concerning his untimely death. It seemed extremely sad that a man 

 of such fine training and ability, in a position where he had excellent opportunities, 

 and so thoroughly in love with his work, could not live to complete the task 

 which he was so well prepared to do. It seems hardly possible to become re- 

 conciled to this misfortune for him and for us. 



It is the lot of those of us who have corresponded widely with native and 

 foreign botanists to know a considerable number of our correspondents only 

 through exchange of letters and published papers. Added to this is sometimes 

 an exchange of photographs. How eager we are whenever opportunity comes 

 for meeting these erstwhile long-distance friends. These experiences are so 

 common that botanists will realize my pleasure when it became certain that I 

 was to spend a month at Harvard in 19 15 and have the privilege of a personal 

 acquaintance with my hitherto far-distant friend. Early in the month, there 

 was a week-end visit to the Riddle Home in Wellesley, where Mr. and Mrs. 

 Riddle made me feel very much at home. This visit was filled with enthusiasms 

 such as botanists know very well, the particular field of interest varying of course. 

 Specimens and methods were gone over, and when we were too exhausted for 

 more of this, the town and the college were examined for diversion and inform- 

 ation. While passing through various parts of Wellesley meeting citizens and 

 discussing matters of local interest, I learned of Doctor Riddle's outside interests 

 and his usefulness in the community. 



He made it a point to come to Cambridge as often as possible while I was 

 there; and it was here, and in his home where he did his microscopic work and 

 made notes, drawings, keys, and descriptions, that my high opinion of his methods 

 and results, obtained through his letters and his published papers, was verified 

 by first-hand knowledge. While at Harvard, I was working on the Graphidaceae, 

 and it was my privilege to determine a considerable number of specimens of 

 this family sent to him from Mexico, Bermuda, Jamaica, Porto Rico, and else- 

 where. For this I was amply repaid by the help which I received on lichens 

 from other groups. I have regretted very deeply that I was not able to spend 

 more time in the cryptogamic herbarium at Harvard during the lifetime of my 

 teacher. Doctor Farlow; but I had hoped after Doctor Riddle went to Harvard 

 that I might have the pleasure and advantage of working with him in the years 

 when I hope for more leisure. 



Here was a man eminently fitted by training, ability, and natural inclination 

 to do work of lasting importance in a field where workers are few and needs 

 urgent. He had a love for systematic lichenology, and this rested on a broad 

 training in biological science and special training in the methods of modern 



