Other editions of book HEREDITY of HAIR-LENGTH in GUINEA-PIGS and Its BEARING on the THEORY of PURE GAMETES. & The Origin of a Polydactylous Race of Guinea-Pigs. Papers of the Station for Experimental Evolution at Cold Spring Harbor, New York, Nos. 5 & 6.

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Excerpt from Heredity of Hair-Length in Guinea-Pigs and Its Bearing on the Theory of Pure Gametes, And, the Origin of a Polydactylous Race of Guinea-PigsA litter of four guinea - pigs of a pure short-haired race yielded measure ments which combined are expressed graphically in Fig. 2, A. Starting at birth with a length of about 18 mm., the hairs grew very rapidly during the first week, at the end of which they measured about 25 mm., an average increase of a millimeter a day in the second and third weeks they grew less rapidly, measuring about 29 mm. At the end of two weeks, and 33 mm. At the end of three weeks. At this time the growth of the hairs which the animals bore at birth was practically complete; the hair-follicles now ceased to form medullary substance, and consequently the hair narrowed to a base of solid cortex (fig. I). From this time on the measurements Show from week to week only slight deviations from a length of 3 3 to 3 5 mm.Several series of measurements of the hair of long-haired guinea-pigs, when combined and expressed graphically, are shown in D, Fig. 2. The hair-length at birth is about the same as in animals of class A, or even a little shorter, but the growth rate does not show the series of rapid changes seen in class A. Growth progresses very steadily at an average rate of about min. A day during the first one hundred days and at about mm. A day during the second one hundred days. But a glance at Fig. 2, D, shows that the slowing up of the growth rate is a very gradual process.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Excerpt from Heredity of Hair-Length in Guinea-Pigs and Its Bearing on the Theory of Pure Gametes, And, the Origin of a Polydactylous Race of Guinea-PigsA litter of four guinea - pigs of a pure short-haired race yielded measure ments which combined are expressed graphically in Fig. 2, A. Starting at birth with a length of about 18 mm., the hairs grew very rapidly during the first week, at the end of which they measured about 25 mm., an average increase of a millimeter a day in the second and third weeks they grew less rapidly, measuring about 29 mm. At the end of two weeks, and 33 mm. At the end of three weeks. At this time the growth of the hairs which the animals bore at birth was practically complete; the hair-follicles now ceased to form medullary substance, and consequently the hair narrowed to a base of solid cortex (fig. I). From this time on the measurements Show from week to week only slight deviations from a length of 3 3 to 3 5 mm.Several series of measurements of the hair of long-haired guinea-pigs, when combined and expressed graphically, are shown in D, Fig. 2. The hair-length at birth is about the same as in animals of class A, or even a little shorter, but the growth rate does not show the series of rapid changes seen in class A. Growth progresses very steadily at an average rate of about min. A day during the first one hundred days and at about mm. A day during the second one hundred days. But a glance at Fig. 2, D, shows that the slowing up of the growth rate is a very gradual process.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

By W. E. Castle and Alexander Forbes. 1. INTRODUCTION. In earlier papers (C astle, :o3, :o5) it has been shown by one of us that long or Angora coat in guinea-pigs and rabbits is alternative in heredity to normal or short coat. It has been shown further that in cross-breeding normal or short coat dominates over long coat, in conformity with Mendel slaw of heredity, but that the purity of the gametes formed by cross-breds is not absolute. Impurity of the gametes is indicated by two facts: First, the number of long-haired young produced by cross-bred parents is in excess of the Mendelian proportion, one-fourth; secondly, many of these long-haired young show an imperfect development of the long-haired character, as compared with their long-haired ancestors. Both these facts may be explained by supposing that the alternative characters, short and long hair, which are present in the cross-breds one seen, the other unseen have in many cases failed to segregate, or have segregated only imperfectly, when gametes have been produced by the cross-breds. Accordingly the conformity with Mendel slaw is a qualified one. More extended and detailed studies made by us during the past year confirm these conclusions and add several new facts concerning the behavior in heredity of these alternative characters. The idea advanced tentatively by Castle (:05), that the hair-lengths of guinea-pigs form a discontinuous series of two, three, four or more times the length of short or normal hair, is found to be incorrect. Careful examination of the hair of several hundred guinea-pigs (mostly cross-breds) shows that there occur hairs of practically all lengths from 3.3 cm. up to about 23 cm. The series of supposed maximal hair-lengths of twice 4cm., thrice 4cm., etc., resulted from an insufficient number of observations.(Typographical errors above are due to OCR software and don't occur in the book.)About the Publisher Forgotte

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