. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. VARIATION 17 certain details of structure. For example, note the prominent millc veins on the udder of Tilly Alcartra as shown in Fig. 231. Psychological variations are differences in mental traits. That mental and nervous conditions have verj^ definite effects upon physical con-. FiG. 1.—Morphological variation in number, form and size of leaflets in the blue elderberry, Samhucus glaiica. ditions is well known, but the problem of distinguishing Ijetween pur- poseful action and automatic response,
. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. VARIATION 17 certain details of structure. For example, note the prominent millc veins on the udder of Tilly Alcartra as shown in Fig. 231. Psychological variations are differences in mental traits. That mental and nervous conditions have verj^ definite effects upon physical con-. FiG. 1.—Morphological variation in number, form and size of leaflets in the blue elderberry, Samhucus glaiica. ditions is well known, but the problem of distinguishing Ijetween pur- poseful action and automatic response, between manifestations of reason and manifestations of instinct, is set for the students of animal behavior. While variations in mental characteristics have an important place in eugenics and merit the attention of livestock breeders, yet the inheritance 2 Digitized by Microsoft®. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Babcock, E. B. (Ernest Brown), b. 1877; Clausen, Roy Elwood, 1891-. New York, McGraw-Hill; [etc. , etc. ]
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