570 Anatomy, Physiology , and Pathology of the 



usually worked, and motion is given to it by a strap from the 

 pulley on the testing machine. 



" The resistance (or the work done) now causes the spur-wheel 

 and one end of the second shaft to be carried upwards, and par- 

 tially (in an orbicular manner) round the first shaft. By hanging 

 weights on the lever, the wheel and shafts are prevented from 

 rising, and the power applied and work done indicated by the 

 weights employed. 



*' For instance : If the work done is equal to one man's power, 

 8i lbs. will be the weight required on the lever to keep the whole 

 in equilibrium, supposing the standard of a man's power to be 

 3750 lbs. lifted one foot high per minute. 



" A modification of the principle of this machine has long been 

 in use in paper-mills for disengaging the driving machinery of 

 presses." 



Moat Hall, Dec. 1849. 



XXIX. — A Lecture on the Anatomy, Physiology, and Pathology 

 of the Organs of Respiration and Circidation ; with especial re- 

 ference to the nature and treatment of Pleuro-pneumonia in the 

 Ox. By James Beart Simonds, Lecturer on Cattle Patho- 

 logy in the Royal Veterinary College ; Honorary Member of 

 the Royal Agricultural Society, and its Veterinary Inspector; 

 Corresponding Member of the Societe Nationale et Centrale 

 de Medecine Veterinaire, &c. 



My Lord, — Pursuing the course which I have heretofore 

 adopted in addressing the members of this Society at their annual 

 meetings, I shall not venture to trespass upon your time by a 

 lengthy exordium. To speak of the great and rapidly increasing 

 benefits which arise from these periodic meetings, however in- 

 viting the theme is but a work of supererogation, for all are 

 ready to admit, from the prince of royal blood to the humble ple- 

 beian, that they exercise an important influence both socially and 

 morally over our rural population, and contribute in no small 

 degree to our national welfare and independence. The subject 

 which has been selected for this lecture is one of considerable 

 importance to the agriculturist, as it relates to ' the Anatomy, 

 Physiology, and Diseases of the Organs of Respiration of Domes- 

 ticated Animals,' and to an investigation, in particular, of the 

 nature of that destructive malady affecting the Ox tribe, termed 

 Pleuro-pneumonia. 



In directing your attention to the general structure and func- 



