216 Dr. Bashford and Messrs. Murray and Bowen. [May 30, 



after three in Experiment 53 K ; and after four in Experiment 54 L. Thus 

 the number of successive transplantations while furnishing a convenient 

 label for experiments does not indicate corresponding stages in all the 

 experiments. The number of times a tumour has been successively trans- 

 planted from animal to animal does not give any indication of what its 

 future behaviour on transplantation is likely to be. That is determined 



Transplantation . 



Average 

 percentage 

 in each 

 transplantation. 



Percentage of success 



A. 



C. 



P. 



a. 



H. 



J. 



K. 



M. 



N. 



23 

 24 

 25 

 26 

 27 

 28 

 29 

 30 

 31 

 32 

 33 

 34 

 35 

 36 

 37 

 38 

 39 

 40 

 41 

 42 

 43 

 44 

 45 

 46 

 47 

 48 

 49 

 50 

 51 

 52 

 53 

 54 



14 

 22 

 25 

 15 

 12 

 15 

 29 

 29 

 17 

 14 

 19 

 23 

 24 

 30 

 25 

 28 

 24 

 21 

 17 

 38 

 32 

 41 

 48 

 43 

 40 

 41 

 37 

 36 

 39 

 32 



15 

 5 

 29 

 11 

 13 

 13 

 5 

 28 

 25 

 15 

 33 

 37 

 19 

 25 

 50 

 63 

 31 



30 

 16 

 37 

 10 

 6 

 10 

 92 

 44 

 11 

 15 

 10 



8 



29 

 31 

 29 

 44 



44 



33 



30 

 33 

 54 



63 

 70 



21 

 8 

 90 



18 

 13 

 23 

 40 

 4 

 9 

 17 



11 

 18 



33 

 36 

 29 

 16 

 36 

 53 

 55 

 72 

 43 

 37 

 71 

 7 

 66 

 40 



17 

 40 



16 

 10 



25 



10 

 24 



21 



25 



22 

 14 

 25 

 20 

 53 

 13 



47 

 83 

 3 



55 

 60 

 74 

 26 

 72 



4 

 10 

 14 



20 



10 



37 

 15 

 25 

 10 



10 

 32 



100 

 13 



17 



22 

 33 



33 



84 

 33 



43 

 38 

 48 

 6 



2 

 29 



30 

 67 

 17 

 8 



10 



75 

 33 



33 

 9 

 4 



42 



47 

 46 



34 



24 



43 



11 



41 

 25 

 16 

 15 

 18 

 25 



9 



13 

 32 

 33 

 17 



13 



63 



66 

 59 

 47 

 50 

 61 

 64 

 33 

 43 

 47 



19 



16 



12 

 50 



30 

 31 



9 

 13 

 17 

 14 



5 

 13 



46 



79 

 70 

 50 

 30 

 66 

 10 

 38 

 47 



36 

 9 



21 

 50 

 4 



22 

 25 

 28 



47 



10 



20 

 33 

 13 

 7 

 20 

 15 

 14 

 40 

 10 

 25 



33 



55 I — 

 75 | 61 

 50 — 

 29 — 

 48 — 

 48 40 



7 

 44 

 60 



18 

 17 



4 

 10 

 7 



5 

 20 

 40 

 30 



14 

 21 

 38 



22 



32 

 44 



60 

 43 



18 

 48 



12 



17 



11 



32 

 38 

 4 

 24 



45 



12 

 11 



23 

 30 



16 

 26 

 50 

 33 

 30 

 27 

 45 

 56 

 20 



25 

 43 



8 



13 



4 

 16 



20 

 31 

 25 

 17 



17 

 10 



33 

 62 

 50 



14 

 21 

 22 

 54 



8 



27 

 31 

 13 

 33 

 20 

 11 



5 

 11 



33 



73 

 57 



39 

 40 

 32 

 72 

 38 

 6 



The figures in blacker type refer to tumours which 



mainly, if not entirely, by its previous behaviour as recorded in the curves, 

 although we are not yet able to predict the immediate results of trans- 

 plantation in any one case with certainty. In every transplantation series 

 of implantations are obtained with maximal and minimal percentages of 

 success. Series are obtained in later transplantations in which, on a large 

 number of animals, percentages occur as low as in the earlier transplanta- 

 tions and occasionally negative results. They show clearly that the 

 transplantation to which a tumour belongs does not of itself determine its 



