FuRTin-R Rrsr xRcnrs in Dispasi-s of Plants 543 



Arrhcnius, cancer research man of the Christiania, Norway, Serum 

 Laboratory stained sections of crown gall." Smith saw he was 

 " much interested " and added to his diary account: "" He is one 

 of the few Europeans who believe cancer due to a parasite. I gave 

 him shdes and literature." 



On May 3 Dr. Smith returned to Johns Hopkins for the second 

 of his lectures to Dr. Bloodgood's students. Two or three times 

 in 1922, and once in 1923, he lectured before the third year 

 medical students. They were " a very interesting lot " and on 

 April 19 his audience had consisted of ninety men and women, 

 some of them members of the staff of the laboratory of surgical 

 pathology. His second lecture was followed by microscopic demon- 

 strations and for this purpose he had brought suitable materials 

 from his own laboratory. He spoke for an hour and showed 

 lantern slides of 



crown gall as follows: 1. Primary tumor. 2. Secondary tumors. 3. Tumor 

 strands. 4. Embryomas. 5. Sections showing structure. 6. Granulomas — 

 a. nematode galls, b. tumors on orange due to fungus, c. olive tubercle. 

 7. Tumors due to chemicals produced by Bacterium tuniefaciefis — a. am- 

 monia, b. acetic acid. c. formic acid. 8. Structure of acetic acid tumors — 

 a. early hypertrophied cells, b. later hyperplasia. 9. Hyperplasial growths 

 in fish due to crowngall bacteria. 



At the conclusion, he " received vociferous and prolonged 

 applause." 



The following year, on March 26, his subject was: " Some 

 resemblances between plant and animal tumors." Dr. Finney and 

 Dr. Robert Miller were among the eighty persons present, and, at 

 the end of this occasion, he received " a kind of ovation." 



Smith completed on May 17 his research study of 1922 at the 

 three Baltimore laboratories: the Carnegie Institution's laboratory 

 of embryology. Dr. MacCallum's laboratory of pathology, and Dr. 

 Bloodgood's laboratory of surgical pathology. He returned to 

 Washington for some work at the Hygienic laboratory. He made 

 use of the facilities at the Army Medical Museum; and his last 

 action at his own laboratory on May 19, before leaving for Phil- 

 adelphia, was to consult with Dr. Robert Ervin Coker of the 

 United States Bureau of Fisheries on the habits of egg-laying sea 

 turtles and the feasibility of his working during July and August 

 at the Bureau's laboratory at Beaufort, North Carolina. He did 



