lO 



The larger female, as a rule, has also a larger 

 quantity of milk, and her offspring is more abundantly- 

 supplied with nourishment after birth. Abundant 

 nourishment is necessary to produce the most 

 perfectly formed animal, from the earliest period of 

 its existence until its growth is complete. The 

 power to prepare the greatest quantity of nourish- 

 ment from a given quantity of food dejDends 

 principally on the magnitude of the lungs, to which 

 the organs of digestion are subservient. 



To obtain animals with large lungs, crossing is 

 the most expeditious method ; because well-formed 

 females may be selected from a variety of large size 

 to be put to~a well-formed male of a variety that is 

 smaller. By such a mode of crossing, the lungs and 

 heart become proportionately larger, in consequence 

 of a peculiarity in the circulation of the fcetus, which 

 ■causes a larger proportion of blood, under such 

 circumstances, to be distributed to the lungs than 

 to other parts of the body ; and as the shape 

 and size of the chest depend upon that of the lungs, 

 hence arises a large chest, which is produced 

 by crossing with females that are larger than the 

 males. 



As an illustration of this, we have the larger foal 

 obtained from the roomy draught-mare crossed with 

 a thoroughbred stallion, in comparison with the 

 opposite cross of a thoroughbred mare with a cart 

 stallion. 



The foregoing embrace the opinions of Henry 



