146 
DR. P. P. FRANKLAND ON THE QUANTITATIVE ESTIMATION OF 
Rate. —3'6 strokes per minute. (Tube exposed 18 minutes.) 
9 moulds. 
.0 liq. 
Colonies in flasks. — (a) 17 
(b) 0. 
No. 2. Flask method. 
Volume of air =12 litres. 
Construction of plugs. —(a) Sugared glass-wool. 
(b) Sugared glass-wool and sugar-powder. 
Rate. —2’9 strokes per minute. (Tube exposed 14 minutes.) 
~ , . . n 7 , . „ f 6 moulds. 
Colonies in flasks. — (a) 13- 
(b) 0. 
0 liq. 
. . 7 . . . -7777 . fNo. 1 (glass-wool), 10 colonies. 
11 litres of air yielded, therefore, in\. 
.No. 2 (sugar-wool), 12 
No. 3. Hesse’s method. 
Volume of air = 11 litres. 
13 moulds. 
Colonies in tube, 18 
0 liq. 
control tube, 10 
2 moulds. 
1 liq. 
VIII. Roof of Science Schools. October 25, 1886. Wind E.; very strong and gusty, 
but fairly constant in direction. Rain earlier in the morning. Roads wet, 
pavement dry, roof damp. 11°*3 C. 10.44 a.m. to 11.26 a.m. 
Nos. 1 and 2. Flask method. —(Double plugs.) 
No. 3. Hesse’s method. 
Nos. 1 and 2 were alternated in aspiration; No. 3 was aspirated simul¬ 
taneously in close proximity, the tubes being inclined at the same 
angle. 
No. 1. Flask method. 
Volume of car =18 litres. 
Construction of plugs. — (a) Glass-w r ool only. 
(b) Sugared glass-wool and sugar-powder. 
Rate. —5 strokes per minute. (Tube exposed 15 minutes.) 
Colonies in flasks.—(a) 37 j 2 ® ™° UldS ' 
(b) Lost. 
No. 2. Flask method. 
Volume of air =18 litres. 
Construction of plugs. — (a) Sugared glass-wool. 
(b) Sugared glass-wool and sugar-powder. 
