Data for individual feed intake, liveweight, and egg production were recorded for five genetically different groups of 40 pullets each during 10 test periods of 28-days each. Average ambient temperature at cage level varied from 6.7 C during January to 21.1 C during June. A 2890 kcal/kg metabolizable energy (ME) diet with 16% crude protein (CP) was fed ad lib. Average egg production for the Small Leghorns (SL) was about 60%, for white-egg hybrids (WL) about 75%, for brown-egg hybrids (BL) about 72%, for female line broiler breeders (BB) about 48%, and for broiler-cross pullets (B) about 51%. Average grams liveweight and grams feed intake per hen day were: SL, 1426 and 83.7; WL, 1809 and 104.9; BL, 2610 and 122.9: BB, 4197 and 156.2; and B, 4158 and 167.7.Partition equations which describe the data for SL, WL, BL, and BB, assuming 70% efficiency of use of feed ME for maintenance, tissue formation, and egg formation were: F = (.534 -.004T)W .653 + 2.76AW + .80EM and F = (.259 -.00259T)W-75 + 2.76AW + .80EM. Similar equations for B, assuming 65% efficiency use of ME, are: F = (.589 -.0044T)W°5 3 + 2.9AW + .85EM and F = (.275 -.00275T)W-75 + 2.9AW + .85EM. The terms are: F = grams feed/hen day; T = ambient temperature in °C; W = grams liveweight; AW = grams daily change in liveweight; EM = grams egg mass per hen day.Equations which assume 70% efficiency of use of ME are shown to predict feed intake of a diet containing 2890 kcal of apparent ME per kilogram for white and brown-egg layers and broilerbreeder pullets varying in individual body weights from about 1 to 5 kg. Equations, assuming 65% energetic efficiency, describe feed intake for a group of broiler-cross pullets. (

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FOUR FIGURESOf the five specimens of this species brought to america by Prof. C. C. Nutting in 1922, four had lost and regenerated a portion of the caudal region of the body amounting to about twelve or fourteen segments. One of the four is still alive, the skeleton of another has been prepared and mounted, and the two remaining specimens have been used for myological and histological studies. During the course of the dissection of the muscles it was discovered that the regenerated portion presented striking differences from the remainder of the caudal body region. I n the living specimen the regenerated portion may be distinguished by its markedly lighter color, small size of the scales, tautness of the skin, and firmness to the touch as compared to the rest of the body.With the dissection of the caudal region, other striking differences presented themselves. Over most of the normal portion of the body the skin is stretched quite loosely and is separated from the muscles beneath by a thin fascia;l in the regenerated region it adheres firmly to the underlying tissues.After deeper dissection, the reason for this superficial distinction became obvious. The major part of the regenerated region was not composed of muscle fibers at all. This discovery roused curiosity as to the exact histological composition. 'The dorsal midline, the region covering the gastralen, and the region of attachment of the sphincter colli muscles are exceptions. 61THE ANATOMIC.4L RECORD, VOL. 90: NO.