he investigated.

Annual Increment of Stature (in cm.) from Belgian and American Statistics.
	Belgian (Quetelet, p. 344)	Paris* (Variot et ChauôÙmet, p. 55)	Torontoã (Boas, p. 1547)	WorcesterãÀ, Mass. (Boas, p. 1548)
Age	Height (Boys)	Ann. inôÙcreôÙment	Height	InôÙcreôÙment	Height (Boys)	VarôÙiôÙaôÙbilôÙiôÙty of do. (6)	Ann. inôÙcreôÙment	Ann. inôÙcreôÙment (Boys)	VarôÙiôÙaôÙbilôÙiôÙty of do.	Ann. inôÙcreôÙment (Girls)	VarôÙiôÙaôÙbilôÙiôÙty of do.
Boys	Girls	Boys	Girls
0	50ôñ0	ã	ã	ã	ã	ã	ã	ã	ã	ã	ã	ã	ã
1	69ôñ8	19ôñ8	74ôñ2	73ôñ6	ã	ã	ã	ã	ã	ã	ã	ã	ã
2	79ôñ1	9ôñ3	82ôñ7	81ôñ8	8ôñ5	8ôñ2	ã	ã	ã	ã	ã	ã	ã
3	86ôñ4	7ôñ3	89ôñ1	88ôñ4	6ôñ4	6ôñ6	ã	ã	ã	ã	ã	ã	ã
4	92ôñ7	6ôñ3	96ôñ8	95ôñ8	7ôñ7	7ôñ4	ã	ã	ã	ã	ã	ã	ã
5	98ôñ7	6ôñ0	103ôñ3	101ôñ9	6ôñ5	6ôñ1	105ôñ90	4ôñ40	ã	ã	ã	ã	ã
6	104ôñ0	5ôñ9	109ôñ9	108ôñ9	6ôñ6	7ôñ0	111ôñ58	4ôñ62	5ôñ68	6ôñ55	1ôñ57	5ôñ75	0ôñ88
7	110ôñ4	5ôñ8	114ôñ4	113ôñ8	4ôñ5	4ôñ9	116ôñ83	4ôñ93	5ôñ25	5ôñ70	0ôñ68	5ôñ90	0ôñ98
8	116ôñ2	5ôñ8	119ôñ7	119ôñ5	5ôñ3	5ôñ7	122ôñ04	5ôñ34	5ôñ21	5ôñ37	0ôñ86	5ôñ70	1ôñ10
9	121ôñ8	5ôñ6	125ôñ0	124ôñ7	5ôñ3	4ôñ8	126ôñ91	5ôñ49	4ôñ87	4ôñ89	0ôñ96	5ôñ50	0ôñ97
10	127ôñ3	5ôñ5	130ôñ3	129ôñ5	5ôñ3	5ôñ2	131ôñ78	5ôñ75	4ôñ87	5ôñ10	1ôñ03	5ôñ97	1ôñ23
11	132ôñ5	5ôñ2	133ôñ6	134ôñ4	3ôñ3	4ôñ9	136ôñ20	6ôñ19	4ôñ42	5ôñ02	0ôñ88	6ôñ17	1ôñ85
12	137ôñ5	5ôñ0	137ôñ6	141ôñ5	4ôñ0	7ôñ1	140ôñ74	6ôñ66	4ôñ54	4ôñ99	1ôñ26	6ôñ98	1ôñ89
13	142ôñ3	4ôñ8	145ôñ1	148ôñ6	7ôñ5	7ôñ1	146ôñ00	7ôñ54	5ôñ26	5ôñ91	1ôñ86	6ôñ71	2ôñ06
14	146ôñ9	4ôñ6	153ôñ8	152ôñ9	8ôñ7	4ôñ3	152ôñ39	8ôñ49	6ôñ39	7ôñ88	2ôñ39	5ôñ44	2ôñ89
15	151ôñ3	4ôñ4	159ôñ6	154ôñ2	5ôñ8	1ôñ3	159ôñ72	8ôñ78	7ôñ33	6ôñ23	2ôñ91	5ôñ34	2ôñ71
16	155ôñ4	4ôñ1	ã	ã	ã	ã	164ôñ90	7ôñ73	5ôñ18	5ôñ64	3ôñ46	ã	ã
17	159ôñ4	4ôñ0	ã	ã	ã	ã	168ôñ91	7ôñ22	4ôñ01	ã	ã	ã	ã
18	163ôñ0	3ôñ6	ã	ã	ã	ã	171ôñ07	6ôñ74	2ôñ16	ã	ã	ã	ã
19	165ôñ5	2ôñ5	ã	ã	ã	ã	ã	ã	ã	ã	ã	ã	ã
20	167ôñ0	1ôñ5	ã	ã	ã	ã	ã	ã	ã	ã	ã	ã	ã

Ages from 1ã2, 2ã3, etc.

ã The epochs are, in this table, 5ôñ5, 6ôñ5, years, etc.

ãÀ Direct observations on actual, or individualised, increase of stature from year to year: between the ages of 5ã6, 6ã7, etc.

Even apart from these data of Queteletãs (which seem to constitute an extreme case), it is evident that there are very {68} marked differences