────[D]─── ───────[E]─────── ──────[F]────── ────────[G]─────── Height Height [I] Height [V] [H] [H] Age (Boys) [H] [J] [K] [J] [K] (Boys) (6) [H] ([J]) [V] ([K]) [V] 0 50·0 — — — — — — — — — — — — 1 69·8 19·8 74·2 73·6 — — — — — — — — — 2 79·1 9·3 82·7 81·8 8·5 8·2 — — — — — — — 3 86·4 7·3 89·1 88·4 6·4 6·6 — — — — — — — 4 92·7 6·3 96·8 95·8 7·7 7·4 — — — — — — — 5 98·7 6·0 103·3 101·9 6·5 6·1 105·90 4·40 — — — — — 6 104·0 5·9 109·9 108·9 6·6 7·0 111·58 4·62 5·68 6·55 1·57 5·75 0·88 7 110·4 5·8 114·4 113·8 4·5 4·9 116·83 4·93 5·25 5·70 0·68 5·90 0·98 8 116·2 5·8 119·7 119·5 5·3 5·7 122·04 5·34 5·21 5·37 0·86 5·70 1·10 9 121·8 5·6 125·0 124·7 5·3 4·8 126·91 5·49 4·87 4·89 0·96 5·50 0·97 10 127·3 5·5 130·3 129·5 5·3 5·2 131·78 5·75 4·87 5·10 1·03 5·97 1·23 11 132·5 5·2 133·6 134·4 3·3 4·9 136·20 6·19 4·42 5·02 0·88 6·17 1·85 12 137·5 5·0 137·6 141·5 4·0 7·1 140·74 6·66 4·54 4·99 1·26 6·98 1·89 13 142·3 4·8 145·1 148·6 7·5 7·1 146·00 7·54 5·26 5·91 1·86 6·71 2·06 14 146·9 4·6 153·8 152·9 8·7 4·3 152·39 8·49 6·39 7·88 2·39 5·44 2·89 15 151·3 4·4 159·6 154·2 5·8 1·3 159·72 8·78 7·33 6·23 2·91 5·34 2·71 16 155·4 4·1 — — — — 164·90 7·73 5·18 5·64 3·46 — — 17 159·4 4·0 — — — — 168·91 7·22 4·01 — — — — 18 163·0 3·6 — — — — 171·07 6·74 2·16 — — — — 19 165·5 2·5 — — — — — — — — — — — 20 167·0 1·5 — — — — — — — — — — — * Ages from 1–2, 2–3, etc. † The epochs are, in this table, 5·5, 6·5, years, etc. ‡ Direct observations on actual, or individualised, increase of stature from year to year: between the ages of 5–6, 6–7, etc. Even apart from these data of Quetelet’s (which seem to constitute an extreme case), it is evident that there are very {68} marked differences between different races, as we shall presently see there are between the two sexes, in regard to the epochs of acceleration of growth, in other words, in the “phase” of the curve. It is evident that, if we pleased, we might represent the _rate of change of acceleration_ on yet another curve, by constructing a table of “second differences”; this would bring out certain very interesting phenomena, which here however we must not stay to discuss. _Annual Increment of Weight in Man_ (_kgm._). (After Quetelet, _Anthropométrie_, p. 346*.)