118 
DR. P. F. FRANKLAND ON THE QUANTITATIVE ESTIMATION OF 
XIII. Roof of Science Schools , South Kensington Museum. July 12th, 1886. 
12 litres of air yielded. 72 colonies. 
Control-tube. 27 ,, 
Wind slight. 
XIV. Ditto. July 21st, 1886. 
12 litres of air yielded. 129 colonies. 
Control-tube. 32 „ 
Wind very gentle during the first half, but increasing considerably 
at end of experiment. 
XY. Ditto. August 3rd, 1886. 
10 litres of air yielded. 105 colonies. 
Control-tube. 50 „ 
Wind gentle, but variable in direction. 
XVI. Ditto. September 24th, 1886. 
12 litres of air yielded. 71 colonies. 
Control-tube. 36 ,, 
Wind very gentle, but variable both in strength and direction. 
XVII. Ditto. September 25th, 1886. 
12 litres of air yielded. 32 colonies. 
Control-tube. 16 ,, 
Wind very gentle. 
XVIII. Ditto. October 19th, 1886. 
9 litres of air yielded. 31 colonies. 
Control-tube. 2* „ 
Wind slight, constant in direction. 
XIX. Ditto. October 22nd, 1886. 
11 litres of air yielded. 18 colonies. 
Control-tube. 10 ,, 
Wind gentle, but variable both in strength and direction. 
XX. Ditto. October 25th, 1886. 
10 litres of air yielded. 68 colonies. 
Control-tube. 17\ „ 
Wind very strong, but fairly constant in direction. 
XXI. Ditto. October 29th, 1886. 
12 litres of air yielded. 35 colonies. 
Control-tube. 6 „ 
Wind gentle, but somewhat variable in direction, and more so in 
strength. 
# A liquefying colony liad probably obliterated some of the other colonies. 
f This number is doubtless too small, owing to tube being considerably obliterated by a liquefying 
colony. 
