poi'son ous, likely to do great harm or injury.
sep'a rate, apart from other things.
con di'tion, state; situation.
nec'es sa ry, really needed.
dis a gree'a ble, very unpleasant.
sen'si ble, wise; knowing what is proper.
ac cus'tomed, being used to.
es pe'cial ly, more than usual.
AIR.
We all know very well that we can not live without breathing.
What we do not all know, or do not all think of, is that we want not only air, but good air. We are apt to take it for granted that any air will do for us; stale air, dirty air, even poisonous air.
What makes the matter worse is, that we can not help spoiling air ourselves by the very act of breathing.
If people are shut up in rooms where the bad air can not get out and the good air can not get in at all, they are sure to be made ill.
Some people in Scotland thought they would have a merry Christmas party, and invited their friends to come to a dance.
As it was very cold weather, they shut all the doors and windows tight, and then they began to dance.
It was a small room with a low ceiling, and there were thirty-six people dancing in it all night. By the time morning came the air was so bad that it was really like poison; and very soon seven of the poor dancers were seized with a terrible fever, and two of them actually died.
The air we breathe out is different from the air we take in. We send away some things with our breath which were not in the air when we took it in.