FuRTHiiR Ri;scARCni-s IN DisiiASi-s oi Plants 533 



he wrote Smith that, wliile not denying the importance of his 

 work, he believed that Smith still had " to point out how this 

 process dillers from chronic inflammation in plants." As late as 

 November, 1926, these two scientists enjoyed discussions. On the 

 occasion of their last conference, Dr. Smith wrote in his diary of 

 Dr. Ewing: "About cancer etiology we do not agree, but I am 

 very fond of him. He is an honest man and a brilliant one." 

 That year he had written Dr. James Young,-^ gynecologist of 

 Scotland, and said of Dr. Ewing: 



He is a good friend of mine and I am never hurt by any of his criticisms 

 because he is just as much in earnest to find the truth as I am, a very honest 

 man and an excellent diai^nostician and histologist. We have been scrap- 

 ping back and forth for years over the question of etiology of cancer. The 

 trouble with Ewinc; is that he is not a biologist and as I look at it, the 

 cancer problem is peculiarly a biological problem. 



To his last year, Smith's main work was his study of crown gall, 

 and primarily he was studying this as one of many bacterial dis- 

 eases of plants. In 1920 he prepared with G. H. Godfrey an 

 article on the " Bacterial Wilt of Castor Bean." "-* With Godfrey 

 in 1918 he had published on the " Brown Rot of Solanaceae on 

 Ricinus "; "^ with Miss McCulloch in 1919 on " Bacterium solan- 

 acearum in Beans "; "° with Miss Mary Kathcrine Bryan in 1915 

 on "Angular Leaf-spot of Cucumbers";"' with L. R. Jones and 

 C. S. Reddy in 1919 on "The Black Chaff of Wheat ";-« and 

 with R. E. B. McKenney in 1921 on the tobacco blue-mold (Pero- 

 nospora) disease of Georgia and Florida."^ In 1921 he published 

 on the " Effect of Crowngall Inoailations on Bryophyllum," ^° and 

 in this considered his own work and that of Michael Levine on 

 Bryophylliwi calychium, a West Indian plant which Jacques Loeb 

 had also used in " some of his physiological experiments." "''^ 



" Letter, February 26, 1926. 



-* Jour. A^ric. Res. 21(4): 255-261, May 16, 1921. 



"S<r;V«f£' 48(1228): 42-43, July 12, 1918. 



""^ Science 50(1288): 238, Sept. 5, 1919. 



-''Jour. Agric. Res. 5(11): 465-476, Dec. 13, 1915. See also Miss Bryan's paper 

 on, A nasturtium wilt caused by Bacterium solanacearum, idem 4(5) : 451-458, Aug. 

 16, 1915. 



•^Science 50(1280): 48, July 11, 1919; E. F. Smith, A new disease of wheat, 

 Jour. Agric. Res. 10(1): 51, July 2, 1917; and other authorities cited in Science 

 50: 48. 



*'U. S. Dep't Agric. Dept. Circulars 174, 176, 181, Apr.-June 7, 1921. 



*" Jour. Agric. Res. 21(8): 593-597, July 15, 1921. 



" Letter, Smith to Dr. Cullen, Oct. 6, 1920. 



18 



