APPENDIX. 



expirations. The proof of this is, that they can recom- 

 mence counting with facility. In this illustration we per- 

 ceive that one inspiration is equal to 30 or 40 expirations, 

 therefore we can say that an inspiration is perfect or com- 

 plete according to the effects which it produces. The 

 orator can speak for hours without experiencing the want 

 of breath ; but this circumstance is evidently to be attri- 

 buted to the constant pauses, inseparable from temperate 

 or even energetic speaking. Inspirations may preponder- 

 ate either in number or perfection, from different causes. 

 In one instance, the momentary depressing states of the 

 mind, in the other similar mental conditions, but of a less 

 acute nature, as for example grief, will occasion them. In 

 the latter, the occasional sighs are Inspirations, which in- 

 dicate, in many circumstances, a disordered state of the 

 circulation of blood In the lungs. When inspirations 

 occur in consequence of sudden emotions of the mind, they 

 are excited by impressions which the sensorium has re- 

 ceived from some external object ; but when they take 

 place in depressing passions of a continuous nature, they 

 are occasionally to be referred to congestion of blood in the 

 lungs, conjoined with the operation of the mental cause. 

 And I may here remark, that, although this preponder- 

 ance of the one act of respiration over the other is only 

 temporary, and their equilibrium is soon restored, yet the 

 irregularity is often of sufficient continuance to admit of 

 changes taking place fully calculated to account for the 

 morbid results attributed to them in this work. 



In CCLVI. in speaking of the division of the par va- 

 gum in the different experiments performed to elucidate its 

 function, I omitted to state the situation in which the nerve 

 was divided. The division was generally made about 

 three-quarters of an inch below the glottis. 



