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.1912 Excerpt: ... CHAPTER IV THE STATISTICAL STUDY OP
HEREDITY In studying heredity, either of two methods may be
adopted. We may either choose a character and observe or measure
its development in a large number of parents and in their children,
and so deduce the average extent of resemblance between parents and
children for that character; or we may consider a number of
individual cases separately, and endeavour to discover the manner
in which the character appears in the children who have parents or
ancestors possessing it. With regard to the first method Prof.
Pearson has written 'We must proceed from inheritance in the mass
to inheritance in narrower and narrower classes, rather than
attempt to build up general rules on the observation of individual
instances.' And '...the very nature of the distribution...seems to
indicate that we are dealing with that sphere of indefinitely
numerous small causes, which in so many other instances has shown
itself only amenable to the calculus of chance, and not to the
analysis of the individual instance' 25, 'Math. Contrib. III.'
Phil. Trans. Roy. Soc. A, 1896, p. 255, The second method on the
other hand has been used in cases where the causes of variation
appear to be few and definite, and seeks to isolate these causes.
The first method is thus clearly adapted especially to characters
which vary continuously and which can be measured; the second to
characters which vary discontinuously and can be sharply separated
into classes. The first method gives on the whole the average
intensity of inheritance, but little information with regard to its
probable development in individual cases; the second attempts to
answer the question in what manner the character will be
distributed among the offspring in any family. The founder of the
General Books LLC
|Country of origin:
||246 x 189 x 2mm (L x W x T)
||Paperback - Trade
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