64 WHICH LIVED OVER 277 DAYS 
Figure 80 A (females). — The relationship between physical maturation and the proneness to enter traps. A high maturity 
index represents markedly inhibited growth. Individuals which have lived under the most favorable circumstances are those 
represented by dots nearest the intersection of the ordinate and abscissa. Arrows indicate trends away from such more 
optimum conditions. The constellations A through E represent aggregates of rats with similar histories. The increased 
proneness to enter traps characteristic of constellation B and E are relcted to indications of an augmented anxiety state 
during adult life. The circled dots in figure 80 A are the mean maturity indices for rats having the lower, middle, or upper 
trap proneness indices. 
A reason for believing this becomes apparent 
upon a closer scrutiny of those individuals forming 
the B constellation for males. The discreteness of 
this clump of individuals may be seen in figure 80B. 
The status of this group of males is shown in com- 
parison with the other constellations of males in 
table 16. In this table, in addition to data on 
wounds, there is shown a birth rating score, which 
depicts the author’s opinion as to the degree of 
favorableness of the conditions surrounding the 
early life of these rats. The basis of this rating 
score is shown in table 17. It takes into considera- 
tion: (1) Birth during periods of higher population 
density (i.e., later in the history of the colony) was 
characterized by conditions unfavorable to both 
physical and social maturation; (2) Birth close to 
the food source (i.e., alleys versus areas) was more 
favorable; (3) Birth on the south side of the pen was 
more favorable than on the north side (i.e., due to 
the cultrual concommitants of the first high-ranking 
97 
