630 Third European Journey 



extends farther and farther into the skin in all directions and new 

 invasions follow. His sections show all this very clearly." The 

 " very early stages " meant " before the muscles have been 

 invaded." 



One of their last days in Holland was spent at the Inter- 

 national Flower Show at Heemstede and Lisse. They were invited 

 to this event by Dr. E. van Slogteren who met them at Haarlem and 

 drove them to the exposition grounds. There, among the important 

 exhibits on plant pathology, Smith saw demonstrated the "" marvel- 

 lous effect of [Dr. van Slogteren's] hot water treatment in (l) 

 killing eel worms and (2) stimulating growth. By this treatment, 

 at small cost, the Narcissus [could] be made free from its worst 

 parasite." ^"^ This former student of Dr. Moll at Groningen, who 

 had been offered Moll's place, had tried out the method against 

 other plant diseases, among them, the still serious yellows disease 

 of hyacinths. He took Smith to his laboratory at Lisse and told 

 him " he was not able to control the yellows disease of hyacinths 

 by direct heat, but accomplished the same thing indirectly, /'. e. 

 by exposing the bulbs for a considerable time at 33°C. This tem- 

 perature greatly favors the growth of the bacteria in the diseased 

 bulbs and two months later at planting time he can then easily 

 distinguish and throw out the sick bulbs." 



One more week in Holland would have satisfied Dr. Smith since 

 he had wanted to see " Deelman, Beyerinck, Moll, and Wakker." 

 But to study the English work with the thoroughness he wished, 

 he and Mrs. Smith had to leave Amsterdam on March 30. His 

 work was known of now the world over. Scholars from South 

 America, South Africa, British India, the Philippine and Hawai- 

 ian Islands, Japan, Russia, the Balkan states, Austria, Hungary, 

 Scandinavia, and other world regions, had visited his laboratory. 

 Many had applied to study with him; and many were his corre- 

 spondents in all quarters of the globe. In 1925 he was made a 

 " membre honoraire " of the mycological section of the Russian 

 Botanical Society; and his " splendid work in the study of Bacterial 

 diseases of plants " and his rank as an authority on this subject 

 were regarded as " incontestable." ^'^^ His influence on the plant 

 scientific research work of Japan was especially pronounced. 



^'* Journal, Mar. 29, 1925. 



^^^ In 1921 Dr. N. I. Vavilov and Dr. A. Jaczewski, Russian plant scientists, 

 had been entertained at a botanists' dinner in Washington and by Smith in his home. 



