( 18 ) 
J3ate when Measurements 
Number of 
Mean 
were taken Specimens 
Measurement. 
measured. 
mm. 
September, 1917 
21 
106-55 
September, 1918 
109 
115-02 
October, 1914 
144 
114-54 
December, 1915 
70 
121-60 
January, 1915 
127 
118-64 
January, 1917 
89 
116-48 
January-February, 
1920 
38 
118-02 
February, 1919 
137 
123-23 
Fourth Year. 
March, 1916 . . 
145 
123-92 
March, 1918 . . 
35 
113-78 
April, 1914 . . 
16 
118-75 
April, 1915 .. 
36 
123-33 
May, 1917 . . 
146 
116-41 
May, 1920 . . 
12 
111-67 
June -July, 1919 
132 
121-94 
July, 1915 .. 
3 
125-80 
August, 1919 
140 
123-46 
August-September, 
1916 
246 
131 -63 
September, 1913 
130 
132-85 
September, 1915 
273 
128-92 
September, 1917 
83 
127-32 
September, 1918 
68 
] 23 - 53 
October, 1914 
83 
132-74 
October, 1920 
80 
118-25 
December, 1915 
258 
131-50 
January, 1915 
118 
136-87 
January, 1918 
59 
123-51 
January, 1917 
85 
130-21 
January-February, 
1 920 
272 
130-89 
February, 1919 
120 
132-09 
Fifth Year. 
March, 1910 . . 
153 
137-50 
March, 1918 .. 
115 
128-84 
April, 1914 . . 
145 
137-99 
April, 1915 .. 
24 
135-42 
May, 1917 . . 
245 
132-50 
May, 1920 . . 
64 
130-94 
June -July, 1919 
122 
132-18 
July, 1915 . . 
11 
134-31 
August, 1919 
109 
136-68 
August-September, 
1916 
175 
140-61 
September, 1915 
37 
148-71 
