Size in cm. Weight in gm. _W_/_L_^3 × 10,000 _W_/_L_^3 (smoothed) 23 113 92·8 — 24 128 92·6 94·3 25 152 97·3 96·1 26 173 98·4 97·9 27 193 98·1 99·0 28 221 100·6 100·4 29 250 102·5 101·2 30 271 100·4 101·2 31 300 100·7 100·4 32 328 100·1 99·8 33 354 98·5 98·8 34 384 97·7 98·0 35 419 97·7 97·6 36 454 97·3 96·7 37 492 95·2 96·3 38 529 96·4 95·6 39 564 95·1 95·0 40 614 95·9 95·0 41 647 93·9 93·8 42 679 91·6 92·5 43 732 92·1 92·5 44 800 93·9 94·0 45 875 96·0 — {99} Now while this _k_ may be spoken of as a “constant,” having a certain mean value specific to each species of organism, and depending on the form of the organism, any change to which it may be subject will be a very delicate index of progressive changes of form; for we know that our measurements of length are, on the average, very accurate, and weighing is a still more delicate method of comparison than any linear measurement. [Illustration: Fig. 21. Changes in the weight-length ratio of Plaice, with increasing size.]