The Grange advance., 1874-04-22

peroeptible to the ,ense Of smell. Organic
matter, in a stateEs of decay, is also added
to the cir from soiled clothing.
In addition to these impurities given off
directly to the air by the human body there
ore suspended solid matter from dust and
chalk, and if the room is not we'll ventilated
and has been long occupied there are addi-
tionsl impurities from old accumulations OF
filth on the floors, furniture and walls.
It is thus evidsnt that ventilation alone
is not able to secure healthy atmosphere
in school rooms. It must be accompanied
BY cleanliness Of persons, floors, furniture
and walls y
Authorities differ little as|to What de-
gree Of impurity Of air c,n Ae liberated,
without injury 20 healtb, FROM tie above
sources. An average estimate would be
that it should not contain more than eight
parts Of carbonic acid in ten thousand Of
air, and it is matter Of actual experiment
that to secure that, at least two thousand
cubic feet of fresh air must be furnished
every hour to every person in the room.
To illustrate this one Of the school rooms
WAS taken ss an example. Its size is
30130x13 feet, containing ll,700 cubic feet
Of air, and 81 persons. To supply each
person with 1000 cubic feet of air will re-
quire $1,000 cubic feet of fresh air each
hour 50 that in that time the air Of the
room must be changed more than six times.
The ventilating draft has sectional area
of l7xl9 inches, and through it the $1,000
cubic feet Of air must pass at the rate of
no, far from $50 feet per second. To ena-
BILE this moveme ent to take place the temper
ature Of the air must be at least 100 -
above that Of the outside air and the draft
should be 20 feet high.
So it is evident that the ventilation of
school houses. rs Of dwellings, is insepera-
bic from the warming. and they must be
worked out together. These school build
ings are heated by stoves and no provision
is made for supply Of fresh air. The on
ly source is therefore through the cracks
of doors and windows and through the
floors and walls. 1t is not therefore sur
prising that we find the proportion of car
bonic acid in the rooms to average 18 parts
iu 10000 of air, four and half times
greater than in the open air, and more than
twice greater than the amount which can
be respired with safety to be- klth.
1t is for this reason thaA teachers are
compelled to open windoA . any doors, even
in the severest weather Of winter, and that
the greatest difficulty is ID 4und in securing
the proper and regular temperature. Our
experience here II rnst of the public
schools throughout our country. The ef-
fects Of this neglect to afford pure air to
scholars and teachers are apparent in their
health. Our State Board Of Health are
making thorough study of the facts and
the remedy. It is hoped that the result
will be popular demand which shall re-
suit in q radical reformation.
The teachers were commended for their
efforts to remedy the defects Of their school
rooms in this regard, and several devices
were suggested to assist them. The defects
are, however, those Of the original con-
struction of buildings aud can only be re-
moved, now, BY careful study of each
room and the adoption Of the proper reme-
dy by the school boards. After showing
that proper system would be of as much
use in summer as in winter, and is as nec-
essary then the Doctor concluded by in
dicating from the stand point of health
what school rooms should be, in the in
terest Of scholar, teacher, and the public
alike.