New York AGRICULTURAL EXPERIMENT Station. 107 
that made by Lot XIV and the gain made by Lot XVI was 
about 7 per ct. greater than that made by Lot XV. The amount 
of dry matter in the food consumed for each pound gain in 
weight was 4.4 pounds for Lot XI and 3.8 pounds for Lot XII; 
the amount was 4.7 pounds for Lot XIII and 4.5 pounds for 
Lot XIV. It was 5.8 pounds for Lot XV and 5.0 pounds for 
Lot XVI. The figures show that while the rapidity of growth 
was about the same under both rations, the vegetable-food ration 
was used more efficiently by the growing chicks. A smaller 
amount of food was required to produce results equal to those 
produced by a much larger amount under the ration containing 
animal food. 
The difference in the cost of food was due not so much to the 
somewhat greater consumption under the one ration, but more 
to the difference in cost of the two mixtures which constituted 
half the food in the respective rations. ‘The difference in the 
food cost of the gain made is therefore due not alone to the some- 
what greater efficiency of the one ration but more to the valua- 
tion of the different foods necessarily used. 
The food cost of each pound gain in weight made by Lot XI 
was 5.3 cents and of that made by Lot XII 4.2 cents. For Lot 
XIII the cost was 5.6 cents and for Lot XIV 4.9 cents. For 
Lot XV the cost was 7.0 cents per pound and for Lot XVI 5.4 
cents per pound. In rapidity of growth there was little practi- 
eal difference, equal weights being reached by contrasted lots at 
the same age. While at ten weeks of age equal weights had 
been attained by contrasted lots, at twelve weeks the average for 
Lot XIII was slightly heavier than that of Lot XIV. The 
weights of other lots at twelve weeks still bore the same relation. 
EXPERIMENT WITH DUCKLINGS, SECOND SERIES. 
Of the two lots of Pekin ducklings, Lot C was fed the ration 
containing animal food and Lot D the vegetable food ration with 
the bone ash. In the accompanying tables the data in regard to 
the feeding are given up to the age of ten weeks. After ten 
