Now Ready. New and Enlarged Edition of 



THE REALM OF NATURE 



AN OUTLINE OF PHYSIOGRAPHY 



By H. R. MILL, D.Sc, LL.D. 



Director of the British Rainfall Organisation 



Second Edition. Revised and entirely reset. With 19 Coloured Maps and 



73 Illustrations in the Text. 5s. 



"No book of a like nature, however, covers so much ground with such com- 

 mendable accuracy, or is as indispensable to students as this one, and the volume 

 long since has made a recognised place for itself through its many merits."— Scolds k 

 Geographical Magazine. 



THE 



JOHN HOWARD McFADDEN RESEARCHES 



Vol. IV. 



RESEARCHES INTO INDUCED 



CELL=REPRODUCTION IN AMOEBA 



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 Zvo. $s. 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 amcebse. 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 processes of encystment and excystation 

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



LONDON: JOHN MURRAY 



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