18 DEPARTMENT BULLETIN 1492, U. S. DEPT. OF AGRICULTURE 
was true of the hogs fed peanuts and of the 85 to 114 pound pigs 
on soy beans, both already reported in this bulletin. Points A, B, 
and C represent gains of 30, 76, and 122 pounds on corn with tank- 
age after gains of 15, 38, and 61 pounds, respectively, on the soften- 
ing ration. In other words, the gain on the hardening ration was 
double that on the softening ration in each instance. Each of the 
three points indicates a degree of firmness classing such hogs as 
medium soft, all three refractive indexes falling between 1.4601 and 
1.4605, inclusive. These results formed the basis of the conclusion 
just stated. Figure 7, however, also shows that gains on hardening 
feed much greater than those indicated by points A, B, and C were 
insufficient to produce strictly hard hogs. 
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Fig. 6. — Hardening on corn with tankage following softening on soy beans, 
weights of pigs, 85 to 114 pounds 
Initial 
FEEDING RESULTS WITH CORN AND TANKAGE FOLLOWING SOY BEANS 
Feeding results are available from the eight experiments in which 
corn was fed with tankage following soy beans to pigs having aver- 
age initial weights, in the different tests, of more than 84 pounds. 
As stated, the feeding was done at the Mississippi station and at the 
Animal Husbandry Experiment Farm, and covered the period from 
late in 1921 to early in 1925. The actual range of average initial 
weights in the eight experiments was from 88 to 144 pounds, inclu- 
sive. The average initial weight of the 122 hogs used was 109.61 
pounds. 
In the four experiments at the Mississippi station the Mammoth 
Yellow variety of soy beans was fed, while in the four at the Belts- 
ville station the Virginia variety was used. In all cases the soy beans 
were " hogged down," beginning after the pods had begun to turn 
