IN LIVING AND DEAD MECHANISMS. 075 



health, and where the climate is temperate, there 

 is no waste of caloric, which is conveyed and 

 applied directly to every part of the body, in 

 combination with arterial blood, by which, the 

 composition and vitality of all the organs are re- 

 newed, while they are endowed with the faculties 

 of motion, sensation, and the exalted attributes 

 of intelligence. 



As an example of the difference between the 

 dynamical effects of ordinary combustion, and 

 that of the living frame, we are informed by Mr. 

 Thomas Wickstead, that during the consumption 

 of 100 Ibs. of small Newcastle coal, in the furnace 

 of the best Cornish steam-engine, a power is ge- 

 nerated equal to the elevation of from 82,000,000 

 to 11 3,500,000 Ibs. a foot high, making an average 

 of above 97,500,000 Ibs. and nearly double that 

 of Watts' engine with the same amount of coal.* 

 But according to the mean result of experiments 

 performed by Emmerson, Desaguliers, Boltori 

 and Watt, Smeaton, Bevan, Wood, Tredgold, and 

 Leslie, as reported in the Journal of the Frank- 

 lin Institute, the tractive power of a first-rate 

 English dray-horse is equal to the elevation of 

 1 6,500,000 Ibs. a foot high in eight hours, when 

 fully exerted. Yet a horse living on 12 Ibs. of 

 farinaceous food per day, cannot consume above 



* He further states, that nearly 8 Ibs. of coal per hour are re- 

 quired to generate a steam power equal to the muscular strength 

 of one horse. 



