132 
DR. P. F. FRANKLAND ON THE QUANTITATIVE ESTIMATION OF 
Rate. —3 - 2 strokes per minute. 
Colonies in flask, 130 j 1 ^ “° ulds ' 
Control-tube containing plug of sugared glass-wool.— Colonies in flask, 1. 
'No. 1, 44 colonies. 
10 litres of air yielded , therefore, in 
No. 2, 43 
Colonies in flask, 125 
Colonies in flask, 5 
II. Roof of Science Schools. September 21 , 1886. Wind N.E., very strong, variable 
in strength and direction. No recent rain. Roads watered. 
No. 1 . Time. —1.50 p.m. to 2.25 p.m. 17 0, 5 C. 
Volume of air =30 litres. 
Construction of plug. —Sugared glass-wool and sugar-powder. 
Rate. —2 - 9 strokes per minute. 
81 moulds. 
0 liq. 
Control-tube containing plug of sugared glass-wool and sugar-powder.— 
2 moulds. 
0 liq. 
No. 2 . Time. — 2.35 p.m. to 2.57 p.m. 16 0, 5 C. 
Volume of air — 30 litres. 
Construction of plug. —Sugared glass-wool only. 
Rate.—P§ strokes per minute. 
_ 7 . . n 7 [54 moulds. 
Colonies m flask, 75 j ^ y 
No control-tube. 
No. 3. Time,— 3.0 p.m. to 3.45 p.m. 14°‘5 C. 
Volume of air = 30 litres. 
Construction of plug. —Sugared glass-wool and sugar-powder. 
Rate. — 2 ’5 strokes per minute. 
„ 7 . . n 7 _ 149 moulds. 
Colonies m flask, 79 j 
No control-tube. 
No. 1 , 40 colonies. 
10 litres of air yielded, therefore, in ■< No. 2 , 25 ,, 
No. 3, 26 
III. Roof of Science Schools. September 22, 1886. Wind N.E., strong and 
variable. No recent rain. Roads watered. 
No. 1. Time, —11.32 a.m. to 12.6 p.m. 
Volume of air — 30 litres. 
Construction of Plug. — Sugared glass-wool and sugar-powder. 
