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ment and frank criticism. For him, purely destructive criticism had 
no charm; he always took pains to be stimulating and constructive. 
His sincerity and generosity inspired confidence and affection. He had a 
keen sense of humor, and with a boyish sense of fun he combined the 
mature judgment and cautious outlook of a philosopher. He loved to 
write and talk of his work: ‘‘You can hardly imagine how isolated I 
am here. My correspondence with friends and fellow-workers has 
been a great source of joy and satisfaction.” 
It was a privilege to know Natuorst. His achievements won for 
him a preeminent position among his colleagues, but one thinks of 
him, now that he has gone, not so much as the stimulating teacher that 
he unquestionably was, but more especially as a very human friend, the 
memory of whose generous spirit and affectionate regard is a precious 
possession.—A. C. SEwarp, Cambridge, England. 
