of different Breeds of Sheep. 
79 
lung of the Cotsvvolds, Leicesters, and cross-breds, than the 
Downs, would probably have been lessened had the former been 
as long on fattening food as the latter. Again, the higher pro- 
portion of lung among the Leicesters than the cross-breds is not 
what we should expect, but the higher average among the former 
is obviously due to the very high amount of those of the Leicester 
sheep of smallest increase. This excessive proportion of lung is 
consistent enough with very little tendency to increase ; and we 
find indeed the largest proportion of lung among the animals of 
smallest increase, in the case of every lot except the Cotswolds. 
It may be, however, that activity of respiratory function is not, 
under all circumstances, indicated by comparative weight of lung 
alone. A comparison of the proportional weights of the heart, 
and the other internal organs or viscera of animals of different 
breeds, or differently fed, would be unsuited to the objects of this 
paper ; but this is a subject which it is our intention to treat of 
on some other occasion, together with that of the comparative 
composition in a more chemical point of view of our domestic 
animals in different conditions of fatness or maturity. 
Comparing then together all the six lots, the results as a 
whole pretty generally confirm the usually current views as to 
their characteristic tendencies and qualities. And, in a word, it 
may be said that the greater the tendency to rapid growth, to 
early maturity, and to give a large proportion of gross increase to 
food consumed, the fatter will be the carcass, the coarser the 
mutton and wool, the less the proportion of butcher's valuable 
offal, and the less the hardiness of the animal under exposure and. 
exercise. Thus the Cotswolds and the new Leicesters (though 
the latter have certainly not fully borne out their current cha- 
racter in these experiments), if they do possess the quality of 
giving a comparatively large return of gross increase for food 
consumed, they at the same time give fatter carcasses, are less 
hardy, give less valuable offal, and yield a lower price for a given 
weight, both of mutton and wool, than either the Downs or their 
crosses. 
This brings us to the consideration of the comparative money 
value of the different lots. In the concluding lines of the 
Summary Table are given the prices per stone (8 lbs.) of mutton, 
the money return per head sold dead and sold alive (excluding 
wool), and the return per head, and the prices per lb. of the wool, 
as realized in the actual sales of the experimental sheep. Since, 
however, some of these sales were not only made in different 
markets from the rest, but even in different years, no general 
comparison of them can be made ; hence the " Balance Accounts" 
which have been given from time to time, as affording the best 
