45 



pleted, and a number of other valuable and interesting memoirs remain 

 unfinished." 



As among his publications, we will still add a Catalogue of the Phcen- 

 ogamous Plants of the United States, east of the Mississippi and of the 

 Vascular Cryptogamous Plants of North America, north of Mexico. This 

 was published during the summer of 1868, and was a work much 

 needed to facilitate exchanges among botanists. 



During February, 1864, before leaving California for the Sandwich 

 Islands, he and Mr. Brigham went together to Virginia City, in 

 Nevada, and also to the Geysers, collecting such plants as came in 

 the way, Horace collecting with much delight the splendid lichens of 

 California. 



Mr. Mann left the Hawaiian Islands for San Francisco, en route for 

 Cambridge, May, 1865. He and Mr. Brigham had planned a voyage to 

 Micronesia, but at the last moment the captain refused to allow them 

 to trade with the natives for corals, to the extent that they desired, 

 and the project fell through. 



This expedition to the Hawaiian Islands proved of great advantage 

 to his health. He had begun to loose ground by too intense applica- 

 tion, but the constant life in the open air in a delicious climate, and*his 

 perfect dietetic habits, reinstated him completely. To use his father's 

 words; "he always ate to the glory of God." 



With these facts before us we need hardly ask how one so young 

 and so delicate by nature succeeded in accomplishing so much work 

 and in doing it so well. It often happens that one element of charac- 

 ter gives the key to all others and explains the result of a life-work. 

 In the case of our departed friend this one element was thoroughness 

 a constant seeking after the depths. 



As a student he was accustomed to read and re-read the same book 

 or articles over and over again, until, when at last it was laid aside, 

 he was perfect master of it. Hence the accuracy of his knowledge.. 

 As an investigator his tenacity of purpose was equal to his desire to 

 avoid error by crude observation or hasty generalization. This one 

 feature was enough to have stamped him as no ordinary character ; 

 for in this age of fierce struggle for mental supremacy there are few 

 who can resist the temptation to rush into print with at most, but the 

 probability of being completely and absolutely right. This morbid 

 desire for reputation tends rather to make its possessor notorious, 

 and inflicts on the world legions of scientific errors. No such charge 

 can be laid against the researches of Mr. Mann. He was scrupulously 

 careful and painstaking in his observations. 



This is, perhaps, the proper place to ask what order of mind did he 

 evince ? Was he one of those daring geniuses that come by intuition 

 to great truths, and fling their opinions forth to the criticisms of the 



