INTERACTION OF GROWTH-RATIOS 



193 



capacity of the organ was related to the growth of the body (I 

 am now interpreting the data in terms of the views put forward 

 in this book) according to the law of constant coefficient of 

 growth-partition (Figs. 31, 86). In other words, the amount 

 of growth made by the organ was a function not only of its 

 own higher or lower growth-potential, but also of the amount 

 of growth made by the body, and this was equally true both 

 for normal and transplanted organs. For instance, at first it 

 appeared that tigrinum (rapid-growing) organs grew even 

 faster when transplanted than when left in place, and Harrison 

 put forward an elaborate hypothesis to account for this. It 

 later turned out, however, that this was due to the punctatum 

 hosts having been at an optimum nutritive level, while the 

 tigrinum controls were not being given quite as much food as 



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DAYS AFTER OPERATION 

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and grafted eyes of two species of Amblystoma. 



(B) Reciprocal experiment. Growth of punctatum eye grafted on to tigrinum, compared with that 

 of a normal punctatum eye, and that of the normal tigrinum host eye. 



13 



