Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1920 Excerpt: ... ARE VARIATIONS IN PARENTS TRANSMITTED TO OFFSPRING? (XXXIII-2) The problem. It is a matter of common observation that the young of one generation be,ar more or less resemblance to the parents, but also that they differ from the parents. Interesting studies have been made in the effort to cause these differences from generation to generation to develop along the line of certain specially desired qualities. What to use. The table given on page 174 shows the height of 928 persons whose records were studied by Sir Francis Galton. It is so arranged that the heights of these individuals may be compared with the heights of their parents and the inheritance of stature may thus be seen. What to do. 1. In the third horizontal space from the top the figure given indicates the size-groups in which the children are classified. The vertical column at the left (column 1) gives the heights of the parents, the heading "Mid-Parental Height" meaning the middle point between the heights of two parents in a family. In column 16 at the right the figures in each space represent the average height of all children of parents of the heights indicated in the corresponding space in column 1. The other figures of the table indicate the distribution of the children. The way in which the table is read is indicated by the following examples: 2. Column 3 shows that among the seven persons whose heights were near 62.2 inches there are three from families in which the mid-parental height was 67.5; three from families with a parental average of 66.5; and one from a family in which the parental average was 64.5. 3. Line b shows that in all the families in which the midparental height was 72.5 inches one child had a height, when adult, of about 68.2 inches; two were 69.2 inches tall; one was 70...
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