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I 



THE 



JOHN HOWARD McFADDEN RESEARCHES 



Vol. IV. 



RESEARCHES INTO INDUCED 



CELL=REPRODUCTION IN AJVKEB^E 



By JOHN WESTRAY CROPPER 



. (M.B., M.Sc. Liverpool, M.R.C.S. Eng., L.R.C.P. Lond. 



And AUBREY HOWARD DREW 



With Illustrations. Demy Svo. 5s. net. 



This volume is a continuation of the Researches which are being Carried out under the 

 auspices of the John Howard McFadden Research Fund into the cause of Cancer and 

 other forms of cell-proliferation. It describes the influence of Auxetics (exciters of cell 

 division) and of Kinetics (augmentors of cell division) in inducing reproduction of amoebae. 

 It also shows that the presence of these substances in the environment may bring about 

 variations in the characters of the individual cells. The possibility of ferments playing 

 some part in the phenomenon of cell-reproduction is introduced, and the mode of action of 

 Auxetics and Kinetics is suggested as being due to a combination of these factors. The 

 advantages of the jelly method of examination of living cells are pointed out. The steps 

 required to cultivate the amoeba in the absence of all other living organisms are given in 

 detail. Experimental evidence is brought forward that the process of encystment ami ex- 

 cystation are due to certain bacterial products, and a parasite of the amceba is described. 



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