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THE AMERICAN NATURALIST [Vol. XLVI 



larger than the ordinary native range cattle is fully con- 

 firmed by my observations. The hybrids shown in Fig. 

 4 (center), which had had no other advantage than the 

 range conditions, weighed 1,400 pounds at two years old. 

 The hybrid heifer, shown in Fig. 3 (at the right), which 

 had run on the range, weighed 1,000 pounds at twelve 

 months old. The bull, Fig. 3 (on the left), weighed 1,450 

 pounds at 26 months of age. These weights appeared to 

 me to be more than 50 per cent, greater than the average 

 of the native cattle at the same age kept under similar 

 circumstances. 



A pure Brahma bull will put seventy-five to eighty 

 cows with calf each season, while the native or even high- 

 grade Hereford or Durham will impregnate only twenty- 

 five or thirty cows. 



I desire to express my gratitude to Mr. Borden for 

 courtesies shown me while studying and photographing 

 the herds and for reading and correcting the manuscript, 

 and to Professor T. J. Headlee for the arrangements 

 which made the trip possible; I am further indebted 

 to Professor Headlee for suggestions while writing the 

 paper and arranging the illustrations. 



