94 STATES OF THE BIVEE PLATE. 



the winter sets in ; and the ewes, being kept in good con- 

 dition by a daUy ration of hay, in addition to the grazing, 

 and a httle corn for the highest bred ones, coupled with 

 the requisite protection, there will be no fear of the lambs 

 suffering. 



The weaning time will fall in September, and the lambs 

 will have the rich, succulent spring grass to supply the 

 place of their dams' milk, and wUl be well-grown and 

 strong before the summer heats come on ; the ewes will 

 have time to accumulate strength and condition by the 

 time of their next impregnation ; and, I believe, that under 

 no other arrangement could so favourable a combination 

 of circumstances be obtained. 



m. 



Thermal influences, and their regulation, are not less 

 important niatters. It is necessary in respect of these 

 regulations that the mean temperature of a locality, or 

 climate, should be taken into account, together with the 

 extremes of thermal variation ; and it is essential to have 

 a right understanding of their influences. 



There must be a certain heat diffused throughout the 

 body, or the vital action is in abeyance, or ceases, and 

 reconstruction, or development, cannot proceed. This 

 heat is generated as explained by the combustion of the 

 hydro-carbons of the food taken ; and the quantity of 

 such constituents of the food required to maintain this 

 heat, is mfluenced by the external temperature — the 

 temperature of the surrounding atmosphere. 



The action of external cold is that of reducing the heat 

 of the body, on the principle of transmission, or evolution, 

 of heat — the equahsing of the temperatures of substances 



