93 NATURAL INHERITANCE. [CHAP. 



the Table so far as it now concerns us. The horizontal 

 dotted lines and the graduations at their sides, cor- 

 respond to the similarly placed lines of figures and 

 graduations in Table 11. The dot on each line shows 

 the point where its M falls. The value of its M is to 

 be read on the graduations along the top, and is the 

 same as that which is given in the last column of 

 Table 11. It will be perceived that the line drawn 



FIG. 10. 



6 68 70 



-DEGRESSION 



FROM 



"MID -PARENT 

 TO SON 



through the centres of the dots, 'admits of being inter- 

 preted by the straight line C D, with but a small 

 amount of give and take ; and the fairness of this 

 interpretation is confirmed by a study of the MS. chart 

 above mentioned, in which the individual observations 

 were plotted in their right places. 



Now if we draw a line A B through every point where 

 the graduations along the top of Fig. 10, are the same 

 as those along the sides, the line will be straight and 

 will run diagonally. It represents what the Mid- 



