Título: Francis Galton
Seção: Empirical test of pangenesis and Lamarckism
Background: Galton was born at "The Larches", a large house in the Sparkbrook area of Birmingham, England, built on the site of "Fair Hill", the former home of Joseph Priestley, which the botanist William Withering had renamed. He was Charles Darwin's half-cousin, sharing the common grandparent Erasmus Darwin. His father was Samuel Tertius Galton, son of Samuel "John" Galton. The Galtons were famous and highly successful Quaker gun-manufacturers and bankers, while the Darwins were distinguished in medicine and science.

Conteúdo: Galton conducted wide-ranging inquiries into heredity which led him to challenge Charles Darwin's hypothesis of pangenesis. Darwin had proposed as part of this model that certain particles, which he called "gemmules" moved throughout the body and were also responsible for the inheritance of acquired characteristics. Galton, in consultation with Darwin, set out to see if they were transported in the blood. In a long series of experiments in 1869 to 1871, he transfused the blood between dissimilar breeds of rabbits, and examined the features of their offspring. He found no evidence of characters transmitted in the transfused blood.  Darwin challenged the validity of Galton's experiment, giving his reasons in an article published in Nature where he wrote:  Now, in the chapter on Pangenesis in my Variation of Animals and Plants under Domestication I have not said one word about the blood, or about any fluid proper to any circulating system. It is, indeed, obvious that the presence of gemmules in the blood can form no necessary part of my hypothesis; for I refer in illustration of it to the lowest animals, such as the Protozoa, which do not possess blood or any vessels; and I refer to plants in which the fluid, when present in the vessels, cannot be considered as true blood. The fundamental laws of growth, reproduction, inheritance, &c., are so closely similar throughout the whole organic kingdom, that the means by which the gemmules (assuming for the moment their existence) are d

user: What is the empirical test of pangenesis and Lamarckism?

assistant: Galton explicitly rejected the idea of the inheritance of acquired characteristics (Lamarckism),

user: Did he develop the empirical test?

assistant: he transfused the blood between dissimilar breeds of rabbits, and examined the features of their offspring.

user: What was he hoping to prove by doing this?

assistant: He found no evidence of characters transmitted in the transfused blood.

user: Did he consider this test a failure?

assistant: Darwin challenged the validity of Galton's experiment, giving his reasons in an article published in Nature

user: Did Galton ever respond when Darwin questioned the validity of his experiment?

assistant: CANNOTANSWER

user: What year did he conduct the experiment?

assistant: 1869 to 1871,

user: Were the results published in any journal or scientific publication?

assistant: He went on to found the biometric approach to the study of heredity, distinguished by its use of statistical techniques to study continuous traits and population-scale aspects of heredity.