HETEROGONY OF DEER ANTLERS 



47 



where by the attainment of maturity it was normally below 

 i*o. This purely quantitative difference in the rate of change 

 with age would suffice to explain the apparently contradictory 

 results (Fig. 28). As to the biological causes underlying this 



Kg. Body wt 



o-i 



hO-08 

 0-06 



1-0O4 



8 10 10 30 40 60 80 100 150 200 



Fig. 28. — Diagram to compare probable method of antler-growth in Red and 

 Roe-deer ; logarithmic plotting. 



X — X, the curve for adult red deer (see Fig. 25). A — A and B — B, probable curves for individual 

 antler-growth with age in a small and a large specimen respectively. Y — Y, the curve for adult 

 roe-door (see Fig. 27). C — C, probable curve for individual antler-growth in a typical roe-deer 

 specimen, rising at first more rapidly, but then sinking much lower than the corresponding curve for 

 red deer. 



