620 Third European Journey 



guest . . . from America, the discoverer of the cause of cancer in 

 plants." After the meeting, Dr. Blumenthal entertained him. 



Next afternoon Dr. Smith again worked with Dr. Auler and 

 Miss Meyer studying sections of various rat tumors from PM and 

 L. The PM tumor, he concluded, " is a curious one. In the mouse 

 it produced horncelled cancer. In the rat mostly mixed tumors but 

 sometimes carcinoma (not alveolar) and at other times (in other 

 transplants) typical sarcoma. Whatever the type it is a malignant 

 tumor metastasizing freely. This morning I selected a white rat 

 to take with me. . . ." ^' He also picked out five stained slides of 

 L and PM. After he had examined the results of some dissections 

 they had made, he exclaimed, " I must work longer in this labora- 

 tory! " He had been urged to stay. That morning he had shown, 

 and explained, his crown gall photographs to Dr. Blumenthal, Dr. 

 Auler, Miss Meyer, and two visitors. Dr. Lewin and Dr. Paul 

 Lazarus. Dr. Lazarus had studied some time in Paris and knew 

 Dr. Gosset. Late that afternoon, he received notice that, because 

 of his " important services to cancer research," he had been made 

 a foreign associate of the Deutsches Zentralkomitee zur Erforsch- 

 ung und Bekiimpfung der Krebskrankheit E. V. 



From a young American doctor he learned there was much 

 skepticism concerning the merit of the discoveries made by 

 Blumenthal, Auler, and Meyer. One objection being raised, " a 

 perfectly foolish one," Smith said, " since I have never tried it," 

 was, " How should they be able to find BacL tumefaciens in 

 cancer, if Smith, the discoverer of the organism, could not find it 

 there? "^^ 



The same American doctor told him of a Dr. Otto Warburg 

 who, at the Kaiser Wilhelm Institut fiir Biologie, had " worked a 

 great deal on the cancer cell," and that Smith " might find it of 

 interest to talk with him." He agreed to visit Dr. Warburg and 

 Dr. Carl Posener in their laboratory, and did so on March 10, 

 just before leaving Berlin to go to Copenhagen. From them he 

 was to learn " how they determine the respiration of tissues and 

 how the acid content of cancer cells, all very interesting. . . . They 

 have much delicate and beautiful apparatus for their physiological 

 determinations," he said,'^'' " and after seeing how they work I 



"" Tournal, Feb. 26, 1925. 

 "'"journal, Feb. 27, 1925. 

 »« Journal, Mar. 11, 1925. 



