8 PROTOZOA AND DISEASE 



this impression is erroneous ; in every country workers and thinkers 

 of repute uphold this view, one aspect of which I have held for 

 fifteen years. In 1893 I wrote : * There is now so much evidence 

 for regarding cancer as a mode of psorospermosis that even the most 

 sceptical may take it as a working hypothesis. New lines of research 

 and a hopeful prospect for preventive medicine are opened up. 

 With regard to surgical practice, only a thorough application of 

 measures at present employed is suggested.' 1 These words, with 

 the term * psorospermosis ' changed to ' protozoosis,' I could write 

 again to-day. 



It is not my intention to enter into a critical examination of 

 recent work on the pathology of cancer. That, if it should still 

 appear to be necessary, I propose to deal with in the next part 

 of this work. In. this connection all I plead for at present is a 

 wider view : that the simpler form of malignant disease, sarcoma, 

 be studied as closely as the more complicated epithelial cancer, and 

 that both be subjected to a more minute ocular analysis than has 

 of late been done ; that both be compared closely with syphilitic and 

 variolous lesions ; and that the experimental method be no longer 

 narrowed down to one groove of inoculation-experiment, but be 

 made to include also experiments of the ordinary biological kinds. 



1 ' Morbid Growths and Sporozoa,' 1893, P- 9 1 - 



