410 QUESTIONS ON 



343. What is the average capacity of a man's lungs, when not ex- 

 panded ? How much air is received at each inspiration ? 



344, 345. Does the quantity of air inspired correspond to the amount 

 of wasfsj to be removed? 



346. What are nearly the proportions, of blood, of air, and of waste ? 



CHAPTER XI. 



347, 348. How much air is unfitted for respiration in a minute by 

 the loss of oxygen ? What per cent, of carbonic acid gas unfits air for 

 respiration ? How much does one person unfit in this proportion in 

 one minute ? 



349. How mucli watery vapor will air at 32 contain? How much 

 at 65? at 70? 



350. When is this vapor condensed? When frozen ? 



351. How much air will the vapor from the lungs saturate in a 

 minute? 



352. What other source of moisture ? 



353. What is the average amount of insensible perspiration in a 

 minute ? 



354. In what three ways is air unfitted for respiration? 



CHAPTER XIT. 



355. How much fresh air ought to be supplied to each person per 

 minute ? 



356. 357. What is neglected in dwellings and public rooms ? What 

 partially remedies the neglect? 



358, 359. Mention a deficiency in sitting rooms ; in sleeping rooms. 



360. Deficiencies in public boarding houses, &c. 



361, 362. 363. What other places are still more crowded ? 



CHAPTER XIII. 



364. How large a workshop is thought sufficient for six or eight men ? 

 '365, 366. What other places are badly ventilated? 



367. What facts are mentioned respecting churches? 



368. And halls ? 



369. What facts, respecting school-houses? 



370. To what does habit reconcile us? 



371. Do persons entering a crowded room, and those living in it, have 

 the same sensations? 



372. What fails to be accomplished in such cases? 



373. For what do well-arranged means of ventilation provide? 



CHAPT-ER XIV. 



374. .What correspondence between respiration and vital energy? 



375. What illustration do hybernating animals afford? 



376. What animals are most active ? What most sluggish ? 



377. In the same class, who have a lower life than others? 



378. How does consumption waste the flesh and strength ? 



379. 380. What is a necessary result of imperfect respiration ? 

 381. Why does sleep sometimes fail to refresh? 382. Illustrate 



