Lung Plague and Qholera. 155 



occasions a considerable increase of excretory matter in 

 the blood* during each considerable period of indolent in- 

 action or quietude. 



The natural provision, and only efficient means, for ex- 

 pelling this accumulated excretory matter from the body 

 is by active exhalatory breathing, which is accelerated by 

 regular exercise, mainly in the day-time, or between the 

 periods of quietude. Only by such daily activity in body 

 and breathing can the excess of poison that accumulates 

 during considerable periods of inaction, be worked off by 

 increased daily exhalation through the lungs, and for this 

 necessary purpose, to increase respiration in the day-time, as 

 much as, or more than expiration is reduced during periods 

 of inaction, or of rest or sleep, for the purpose of expell- 

 ing excretory matters from the blood, increased activity 

 and breathing becomes an evident necessity, to insure in 

 creased exhalation, and the discharge of any accumnlatedf 

 excretory matters from the blood, as it courses through the 

 lungs. So regular out-door exercise is an evident daily 

 necessity, as the only means of increasing respiration, thus 

 increasing excretory action, and the supply of oxygen in 

 the artery blood by breathing, at the same time, in corre- 

 sponding degree. 



The increased supply of oxygen in the blood, from ac- 

 tive exercise and breathing, increases the quantity of oxy- 

 gen in the tissues, which is drawn upon in constantly 

 forming carbonic acidj during assimilation. 



*Altlioiigh the urea and the excretory matter passing o£E throngh the skin 

 add, by retention, to accumulated excretory matter In the blood, we restrict 

 our remarks to excretion by way of the lungs, to give more emphasis and 

 point, as nine-tenths of the poison retained in the blood would pass ofE 

 through the lungs, if sufficient exercise were permitted or enforced. 



t " The products of decay not being carried off as fast as they are formed, 

 and not being converted into readily soluble substances, accumulaie^ and 

 seriously interfere with the tissue already formed. As frequently happens, 

 * * certain excremeniitious compounds, which ought to have been entirely 

 eliminated, remain in the fluid," etc.— Scale's PhysiologicalAnatomy, p. 165. 



t Respiratory breathing is the ultimate cause of the blood continuing to 

 flow or circulate. For, although the production of carbonic acid in the tis- 

 sues demands a constant supply of oxygen to replace that which passes from 



