000 



MR JOHN AITKEN ON THE NUMBER OF DUST PARTICLES IN THE 



Table III. — The Number of Dust Particles in the Atmosphere for 1893— continued. 



Place. 



Date. 



Hour. 



Number of 

 Particles 

 per c.c. 



Wind. 



H 



•r-l 



a 



M 



State of 

 the Air. 



Remarks. 





July 

















KlNGAIRLOCH 



10 



11 A.M. 



1,575 



S.E. 0-2 



64 



6 



Medium 



(50). Clouded over. 







3 P.M. 



1,000 



S.E. 0-5 



58 



2 



1 



Clouded over ; been 

 thunder and rain. 







4 P.M. 



1,250 



)) 



62-5 



5-5 



Clear 



Cloud I. 







6.30 p.m. 



1,350 



>> 



62 



5 



>> 



Cloud \; heavy thunder- 

 clouds to E. all after- 

 noon. 







7 P.M. 



1,250 



S. 0.5 



61 



4 



Medium 



(50). Cloud J. 







9.30 p.m. 



2,100 



Calm 



59 



» 



Thickish 



(17). Cloud f. 



»J 



11 



9 A.M. 



2,000 



N.E. 0.2 



62 



5-5 



Medium 



(50). Clouded over. 







10 A.M. 



1,850 



)> 



67 



8 



>> 



(50). Cloud i, thin. 







1 P.M. 



2,300 



S.E. 0-5 



72 



9-5 



)> 



(50). Cloud J. 







4 P.M. 



1,450 



N.E. 0-5 



70 



10 



Clear 



(100). Cloud ^ ; been 

 thunder to S.E., no 

 rain. 







7 P.M. 



1,350 



S.E. 0-5 



64 



8 



Medium 



(40). Cloud f . 







9.30 p.m. 



1,275 



Calm 



57-5 



2-5? 



Clear 



(60). Clouded over ; 

 been rain. 



» 



12 



9 A.M. 



530 



S.E. 1 



65 



7 



>> 



(100). Cloud |, thin. 







10 A.M. 



1 



S.E. 0-5 



64-5 



6-5 



» 



Numbers very irregular, 

 sometimes very high. 







12.30 p.m. 



500 



E. 2 



70 



9 



Very clear 



(200). Thin cloud f. 







1 P.M. 



366 



!) 



>i 



?) 



)> 



(200). 







2 P.M. 



308 



N.E. 1 



67 



8 



j> 



(250). Cloud r %. 







4 P.M. 



247 



N.E. 0-5 



64 



7-5 



>> 



(250). Clouded over. 







7 P.M. 



273 



)> 



61-5 



6-5 



)> 



(200). Cloud &■ 







9.30 p.m. 



329 



Calm 



60 



4 



)> 



(200). Clouded all over. 



» 



13 



9 A.M. 



392 



E. 0-2 



57-5 



3-5 



n 



>) )> 







10 A.M. 



850? 



5J 



59 



5 



») 



(200). Numbers very 

 variable. 







11 A.M. 



192 



Calm 



59-5 



4-5 



j> 



(250). Clouded over. 







1 P.M. 



1,500 



N.W. 0-5 



57 



3-3 



% 



Clouded over ; distant 

 showers. 







2.30 p.m. 



1,275 



)5 



56 



3 



1 



Clouded over ; slight 

 rain. 







1 P.M. 



3,500 



N.W. 1 



56-5 



>) 



Very thick 



(10). Clouded over; no 

 rain. 







7 P.M. 



182 



N.W. 0-2 



56 



2-8 



Very clear 



(200). Clouded over; 

 been slight rain. 







9.30 p.m. 



175 



)) 



52 



3 



>> 



(200). Cloud \. 



>> 



14 



9 A.M. 



98 



N.W. 1 



54 



3-8 



>) 



(250). Clouded over. 







10 A.M. 



85 



>) 



56 



4-5 



>) 



(250). Cloudy; blue 

 haze. 







1 P.M. 



12,250 



N.W. 2 



59 



5-8 



)> 



(200). Cloud \. 







2 P.M. 



13,500 



>) 



57 



5 



)> 



>) )> 







3 P.M. 



12,500 



N.W. 3 



61 



7 



» 



(200). Cloud ]. 







4 P.M. 



11,000 



N.W. 2 



>) 



)> 



)> 



(200). Cloud \. 







5.15 p.m. 



4,500 



)) 



58 



6-5 



)> 



(200). Cloud iV 







G P.M. 



3,900 



N.W. 1 



i) 



6 



>) 



)> !> 







G.30 p.m. 



2,300 



j> 



>> 



)> 



>» 



(200). Cloudless. 







7 P.M. 



2,100 



>> 



56-5 



>) 



)> 



)> j) 







8.30 p.m. 



850 



N.W. 0-5 



53 



4 



)j 



(200). Cloud h 







9.30 P.M. 



378 



N.W. 0-2 



51-5 



j) 



)> 



(200). Cloud |. 



