Agricultural Chemistry. — Pig Feeding. 499 



The figures in these Tables (XVII. and XVIII.), are in all 

 cases the means of two or more determinations agreeing well with 

 each other. The dry matter is determined by drying in a water- 

 bath at 212°. The ash, by burning on platinum trays, in cast-iron 

 muffles arranged specially for that process. The per-centages of 

 ash, as given in the Table, are, however, generally too high, as, 

 to secure a fair sample, the whole bulk of the food was well 

 mixed together ; and, from this, somewhat large samples were 

 taken in the first instance, from which it was impossible to 

 remove all adventitious matters, and especially so when the 

 samples were taken from the bulk in the state of meal. The 

 nitrogen determinations were made by combustion with soda 

 lime, and estimated as the double platinum salt. The fatty 

 matter is that yielded by extraction with ether. 



It is seen, that the Indian-corn and Barley-meal contained less 

 than 2 per cent, of nitrogen ; the Bran about 2| per cent ; the 

 Beans and Lentils about 4^ per cent. ; and the dried Cod-fish 

 about 6^ per cent. 



Of fatty matter, on the other hand, the dried Cod-fish contains 

 less than 1 per cent ; the Beans and Lentils only about 2\ per 

 cent. ; the Barley-meal about the same quantity ; and the Indian- 

 corn and Bran, each about 5 per cent. 



These Tables of the -per-centage composition of the foods, are 

 employed in the construction of all the Tables which will now 

 follow. 



In Tables XIX., XX., and XXL there are given, for the three 

 Series respectively, — the total amount of increase in live weight 

 obtained in each -pen ; also the total amounts consum.ed — of each 

 of the different foods in the fresh state as weighed out to the pigs 

 — and of the dry organic matter — of the mineral matter — of the 

 nitrogen — and of the fatty matter, which those amounts of fresh 

 food contained ; also a summary of the same particulars for 

 several of the pens classed together, as well as for all the pens of 

 each Series respectively. 



VOL. XIV. 



