276 



Dr. P. 



F. Frankland and Mr. T. 



G. Hart. 



2 



Number of 

 micro-organisms 

 falling on 

 1 horizontal 

 square foot 

 per minute. 





o 



CO 



CD 



00 



x>. 

 (M 



% 













Number of 

 colonies from 

 10 litres of air 



(calculated) . 



co 



CO 



CD 

 rH 



00 

 CO 



OS 



<M 



Number of 

 colonies 

 obtained from 

 given volume 

 of air. | 



oa 

 05 



.a 



rH 



CO 



26 in 10 lits. j 



18 in 11 lits. 



68 in 10 lits. 



35 in 12 lits. 



Conditions of experiment. 



Wind S.E., gentle, constant in direction. Bain during 

 morning ; roads wet, roof and pavement nearly dry. 



Wind W. by S.W., gentle, but increased during experi- 

 ment. Roads wet, pavement dry. Rain during previous 

 night. 12-8° C. 



Wind S.W., changing to W., very gentle, but variable. 

 Roads wet; roof still wet in places from heavy dew. 

 Foggy morning, which had cleared to sunshine. 9 "4° C. 



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. 



Wind S.W., gentle, with occasional gusts, fairly constant in 

 direction. Roads and pavement wet. Roof still damp 

 from previous rain. 16 # 3 C. 



). 1886. 



OS * 

 • m . 



si 



c 



CM 



§5 



>er 22nd. 

 -11.25 A.M. 



M 



3! * 



kfi CO 

 CM CM 



i-i 

 C rH 



£ < 



^ CO 

 rH 

 « rH 



Pat< 



Octol 

 4.58- 



Octol 



Octol 

 10.44- 



Octol 

 10.44- 



Octol 

 10.51- 



