J. W. Jenkinson 
455 
(3) The indices or proportions of the parts relatively to the whole may exhibit 
a gradual increase, or an increase at first rapid, later less so, followed eventually by 
a decrease, or a gradual diminution from the beginning, followed sometimes by 
a slight final increase or may be nearly constant. 
There seems to be some reason to suppose that the changes in the variabilities 
of the indices, which exhibit on the whole a gradual decrease, though in some 
cases an increase is shown, depend on changes in the relative growth-rate. 
(4) Correlations between parts are generally high. They exhibit a general 
decrease, with one or two exceptions. This may depend on the observed decrease 
in the growth-rate. 
In the last, as compared with the middle stage, there is however an increase as 
a rule. 
It is difficult to connect this last change with any corresponding change in 
either the absolute or the relative growth-rate. 
It is hoped that these results, though somewhat meagre, may prove useful in 
+ he future, as it is proposed if possible to compare the growth-rate, variability and 
correlation under normal conditions and under conditions which have been made 
unfavourable experimentally. 
LITERATURE. 
(1) F. Boas. The growth of Toronto children. U.S.A. Report of the Commissioner of 
Education, n, 1897. 
(2) F. Boas and C. Wissler. Statistics of Growth. United States Education Commission, 
I, 1904. 
(3) H. P. Bowditch. The growth of children. Massachusetts State Board of Health, 1877. 
(4) C. S. Minot. Senescence and rejuvenation. Journ. Phys. XII, 1891. 
(5) . The problem of age, growth and death. Pop. Sci. Monthly, 1907. 
(6) A. Quetelet. Anthropometric Bruxelles, 1870. 
(7) T. B. Robertson. On the normal rate of growth of an individual and its biochemical 
significance. Arch. Ent. Mech. xxv, xxvi, 1908. 
(8) C. Roberts. Manual of Anthropometry. London, 1878. 
(9) K. Semper. Animal Life, 5th ed. London, 1906. 
(10) H. M. Vernon. The effect of environment on the development of Echinoderm larvae, 
an experimental enquiry into the causes of variation. Phil. Trans. Roy. Soc. 
CLXXXVI B, 1895, 
