Figures 1 36 to 141 . — Growth curves for individuals or for litters. In each figure four to six curves or sets of curves are shown. 
Each of these separate graphs has a circled number in the upper left hand corner. These numbers designate the chart 
number as referred to in the text. For the sake of ready comparison the mean curve for the entire population of that sex 
is shown as a fine continuous line on each chart. The K's, the mean adult weight or length for each litter, was deter- 
mined as the mean of the maximum measurement for each of the members of the litter. 0.9 K, and its age of attainment 
is indicated on each growth curve by a dot with the exact age indicated by an arrow on the abscissa. From time to 
time a change in rate of growth is shown on some of the charts. Had this change in rate not taken place the curve would 
have continued as shown by the broken line. These projected trends were ascertained by log-log plots of growth against 
age. Such plottings result in straight line growth curves in so long as growth rate remains unaltered. For example see 
figures 1 51 and 1 52. The months to which the measurements refer are shown at the tops of several of the charts. 
Figure 1 36 
224 
