248 



of the fat formed which could only have come from carbo- 

 hydrates in the food. Similar but less decisive evidence was 

 adduced from the sheep-feeding experiments, and the view 

 which Lawes and Gilbert maintained on these grounds has 

 since been amply confirmed by the experiments of Kiihn and 

 others. 



IV. RELATION OF FOOD CONSUMED TO LIVE-WEIGHT 



INCREASE. 



Taking the ordinary foods available on the farm, Lawes and 

 Gilbert found that oxen, sheep, and pigs differed greatly in 

 their powers of consuming food, and in the rate at which their 

 live weights would increase. During the whole fattening period 

 oxen will consume per 1000 Ib. of live weight 120 to 150 Ib. of 

 dry food per week (e.g., in the experiments, 25 Ib. cake, 60 Ib. 

 clover hay, and 350 Ib. Swedes), and should produce about 10 

 Ib. live- weight increase per week. Sheep, per 1000 Ib. live 

 weight, will consume in the same time about 150-160 Ib. of dry 

 food (44 Ib. cake, 52 Ib. clover hay, and 70 Ib. Swedes) for a 

 production of 17-18 Ib. increase per week. The same live 

 weight of pigs, consuming 260-280 Ib. of dry food (300 Ib. barley 

 meal), will produce 50-60 Ib. increase. 



These results may be expressed in a table as follows : 



TABLE LXXXIX. 



* Dry Matter of Solid Excrement and Urine exclusive of Litter. 



These estimates, drawn up from a very large number of 

 trials carried out in the ordinary way of farming, have been 

 generally verified by the later exact work of the German experi- 



