. Memoirs and proceedings of the Manchester Literary & Philosophical Society. i*9 i8 17 i*6 15 1-4 1*3 1 2 n LengthDepth inch ; the second set those shells with length 045 to 075inch ; and the third set 075 to 1-05 inch. Curves were now constructed to show the distributionof s and - in these sets. The curves obtained for distribu- tion of 7= for each of the separate sets are shown in Fig: 3. Manchester Memoirs, Vol. lix. (1915), No. 4. 7 The three curves are simply the components of thedistribution curve in Fig. 1. It will be seen from aconsideration of Fig. 3, that each of the three curves is
. Memoirs and proceedings of the Manchester Literary & Philosophical Society. i*9 i8 17 i*6 15 1-4 1*3 1 2 n LengthDepth inch ; the second set those shells with length 045 to 075inch ; and the third set 075 to 1-05 inch. Curves were now constructed to show the distributionof s and - in these sets. The curves obtained for distribu- tion of 7= for each of the separate sets are shown in Fig: 3. Manchester Memoirs, Vol. lix. (1915), No. 4. 7 The three curves are simply the components of thedistribution curve in Fig. 1. It will be seen from aconsideration of Fig. 3, that each of the three curves is /-a 1 1 *• -i r , • Length Fig. %.—Lurves showing the distribution of the ratios -=r—-r-r 6 J b Breadth among ioco individuals of Reticularia /ineala, the indi-viduals being divided into three groups according to size. Dot-dash line = individuals with length of 0T5—0*45 inch. Continuous line — individuals with length of 0*45—075 inch. Broken line = individuals with length of 075—1*05 inch. 140 120 — 100. itself a very regular simple variation curve: separatelytherefore, each confirms the fact deduced from Fig. 1 thatone species only is under consideration. 8 Day, Variation in a Carboniferotis Brachiopod. A very interesting point is brought out by Fig. 3 inthat, as will be seen from a consideration of the figure,there is a very regular displacement of the maximum or mode of the curve towards the right, with each increasein length, and this it will be observed is in the direction of decreasing — ratio. Since the three curves in order from the left correspond to progressive increases inlength, then we may conclude that, as the shells increasedin size {, throughout life) there was a tendency for the value -— to decrease, , for the shell to become The curves obtained for the distribution of —- in the three sets are shown in Fig. 4, and represent the com-ponents of the distribution curve in Fig. 2. Here, as inthe curves in Fig. 3, each curve
Size: 1418px × 1763px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1888
