Davenport has concluded that there are two double factors for black pigmentation in the full-blooded negro which are separately inheritable.
"The Glands Regulating Personality"
Louis Berman, M.D.
But owing to the fact that some inheritable traits or characters are likely to be dominant and others recessive, Galton's law must be modified, so that only under the most favorable conditions can it be regarded as reliable.
"Parent and Child Vol. III., Child Study and Training"
Mosiah Hall
Often a manor court limited a fee in land to certain issue instead of being inheritable by all heirs.
"Our Legal Heritage, 4th Ed."
S. A. Reilly