See CHESTER A. STEWART 
stronger growth tendency in the integument during the early 
maintenance period, or to a stronger tendency to accumulation 
of fat in the normal integument in the later periods. 
In the test rats underfed for very long periods and weighing 
between 30 and 50 grams, the weight of the integument averages 
still somewhat lower than in the controls of corresponding weight, 
although the difference is less marked than in the ten weeks’ 
group. The weight of the integument in the test rats weighing . 
approximately 70 grams at the end of long periods of under- 
feeding, however, averages considerably higher than in the cor- 
responding controls. 
Aron (711) found the skin in dogs held at constant weight to 
show a slightly higher percentage of the body weight than in 
normal control dogs. In these experiments, however, as pointed 
out by Jackson (15 b), if comparison had been made with the 
controls at the beginning of the experiment instead of at the end, 
the opposite conclusion might have been reached. During acute 
and chronic inanition in.adult rats, Jackson (’15 a) found the 
integument to lose weight in nearly the same proportion as the 
whole body. 
Although the integument as a whole in most cases suffers a 
marked loss in weight, it was nevertheless observed that the 
external ear (fig. 1) in the young stunted rats, steadily continues 
to increase in size, and also changes its form so as to approach 
the normal adult appearance. The continued growth of the 
external ear is probably associated with the growth tendency of 
its skeletal (cartilaginous) portion. 
SKELETON 
The ligamentous, moist cartilaginous and dry cartilaginous 
skeletons were prepared as described by Jackson (15 b). The 
moist skeleton was dried to constant weight in an oven at 85°C. 
It is evident from the data in table 1 that the weight of the 
ligamentous skeleton is constantly higher in the test rats than in 
the controls of corresponding weight. In the test rats at ten 
weeks of age there is an apparent Increase in the weight of the 
ligamentous skeleton from an average of 2.357 grams (sexes 
