XX1V PROCEEDINGS. 
TESTS OF THE AIR IN THE CHEMICAL LABORATORY, PROVINCIAL NORMAL 
SCHOOL, TRURO, NOVA SCOTIA. 
C Ose 
Date. |Time. Condition of the Laboratory. (parts in| 
10,000. ) | 
Mar. | A. M. 
4 OH Oloh| ar NAY. aaose se eoho. C006 AoaObN om D>OomOuOeEoecGie> a6 6.42 
14 CHOC atkd ae PEO tc Slat S06 5 ob. cn mos Gap lane cro o Or co .6 Oc 4.28 
15 9.00 tiie Wcicnsdoadcucn daos enn ee UcEmemodeddnane sods - anc 
21 GeO ge ersernc ieee nee ehertete ev ravenonsi) eke (a chair aee ever reeteey 4.28 
22 GROOT OW ek cares Mic ate re acisaeisieys sticks nett eee 16.05 | 
24 QiOO4) “ES 5 pes corte cetera 51: oysteye dane ens todays haters) sins a eVe) © her spseneee 6.42 
17 9.45 |34 students—40 m.—high wind .................... 9.63 
22 9-45 |32 es os windows OPEN ye sie cto srohichocteee 16.05 
is} |! esa) || OC a i) CRP ed ho eRe tara, MONOD CROMER RIC TT OAi oo 20.33 
Tis. || wes@e || «s Ce WINGUOWS OMEN eich «seis at ier seit 9.63 
22a sLOLOOn|\nre es ‘« windows and doors open .......... 16.05 
fs) || sayz) |} “§ 1 h., 40 m., windows and doors open....| 23.54 
GQ) |) wey) |) es ae WROD coe tooo rcoe gad 6c 21.40 
15 TO;4.0))/ 5 sf oe windows @\oleitl Sisoncgsasauces 10.70 
gp |) Wwe) |) OS a slate cucnes emer aetenens te Be nea 5 A oP c 16.05 
AAs || OS ss fe Win GdOWwS/OPEliee.-.c.1aete soe Oe eee 20. 33 
1S |] wa. gs ss ESS) oe asapeciaicuena Syeeieneve nhs ae 17.12 
21 itaname, || 00 es 1 h., 15 m., Blow-pipe lamps in use...... 48.15 
geen |< ss x WANAOWS) OPENle snl. ssi e ie Hoke 
P. M. 
7 GOOK Empty, cccercricin eee Socom ce Secretar 16.05 
10 5-00 US eS albemeaago mo bo cnds o. cubs eGo mumDO DOL OO 6056 20.33 
26 SC] SS beoucshs oun 006 ohdo0n Boouubeowuood én doc 42.80 
27 5-00 Laboratory used for blow- -pipe work in mineralogy for 
Tela Ay Nos lie FO OUCISNES - 5 osancpoGcusadae Jdboc 65.00 
The observations made in the Laboratory were chosen for presentation. 
because they present, 
1. A mean between the worst and best rooms in the building. 
2. <A greater variety of conditions than any other room. 
3. A large air space per pupil—9 cu.m., or 318 cubic feet. 
4. Less interference from other rooms, aud from interruption during 
the test. 
The month of March was chosen because at that time the laboratory 
work consists of lectures and blow-pipe analysis, where few chemical 
re-agents are used and those mostly in the “dry” state. With one 
exception, March 21, no blow-pipe work was done till after 2 o’clock in 
the afternoon. Moreover, March presents many warm days when it is 
possible to have windows open, while in the winter the insufficiency of 
our heating apparatus is such as to make this impossible. It has been 
