688 



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. 



f-< 



3.3 



<v 



H 



•rH 



a 



3 



w 



State of 

 the Air. 



Remarks. 





June 

















KlNGAIRLOCH 



29 



10 A.M. 



168 



N.W. 1 



53-5 



0-5 



Thick 



(6). Raining. 







11.30 A.M. 



196 



N.W. 2 



54 



1 



)> 



Drizzling rain. 







1 P.M. 



294 



)) 



55 



2-5 



Medium 



(35). Clouded over. 







2.30 p.m. 



322 



)) 



56 



3-5 



Clear 



(70). Clouded over. 







5 P.M. 



285 



N.W. 0-5 



55-2 



3-2 



?j 



)5 )) 







7 P.M. 



406 



N.W. 1 



55 5 



4 



n 



(65). Cloud ,&. 







9.30 p.m. 



296 



N.W. 0-5 



54 



3 



Thickish 



(28). Cloud jV 



)) 



30 



9 A.M. 



490 



S.E. 0-5 



56 



>i 



>) 



(28). Cloudless. 







10 A.M. 



1,300 



)) 



58-5 



4-5 



Medium 



(35). Cloudless. 







1 P.M. 



18,000 1 



E. 1 



65 



9 



Clear 



(100). Cloudless. 







3 P.M. 



3,200 



E. 0-5 



68 



9-5 



n 



>! )) 







4 P.M. 



4,300 



■>■> 



67-5 



)> 



Medium 



(60). Cloudless. 







7 P.M. 



4,700 



>> 



65 



9 



>> 



)> >) 







9.30 p.m. 



3,250 



)! 



61-3 



6-8 



Thickish 



(22). Cloudless. 





July 

















>) 



1 



9 A.M. 



3,450 



S.E. 0-5 



65-5 



7-5 



>) 



(21). Only cirrus clouds. 







10 A.M. 



5,400 



S.E. 1 



66-5 



)) 



Thick 



(10). Only cirrus clouds. 







11 A.M. 



3,950 



J> 



70 



9 



Very thick 



(9). Only cirrus clouds. 







1 P.M. 



6,250 



S.E. 2 



74 



12 



Thick 



(13). Only cirrus clouds. 







2.30 p.m. 



4,100 



S.E. 0-5 



72 



10 



)> 



(13). Cloud I. 







4 p.m. 



6,900 



S. 1 



70 



8-5 



Very thick 



(8). Cloud T V 







7 P.M. 



3,450 



>) 



69 



10 



)> 



(9). Cloud i, 







9.30 p.m. 



3,400 



S. 0-5 



66 



8-5 



>j 



(9). Cloud t%. 



>» 



2 



9 A.M. 



2,300 



Calm 



58 



1? 



j? 



(9). Been raining, 

 nearly over. 







10 A.M. 



2,300 



E. 0-2 



59 



1 



3) 



(9). Clouded over. 







1 P.M. 



2,400 



S.E. 0-2 



63-5 



4-5 



Thickish 



(26). Cloud f. 







3.30 p.m. 



1,600 



N.W. 0-2 



65-5 



5 



Medium 



(40). Cloud T °o,verythin. 







4 P.M. 



1,025 



>> 



66-5 



7 



>) 



(50). Cloud -|, very thin. 







7 P.M. 



705 



N.W. 1 



64 



5 



Clear 



(60). Cloud I 







9.30 p.m. 



659 



!> 



58 



3 



Thickish 



(40). Clouded over, thin. 



)5 



3 



9 A.M. 



637 



N.W. 0-5 



60 



4 



Very clear 



(105). Cloud A very thin, i 







10 A.M. 



568 



)> 



66 



6 



Thickish 



(40). Cloud \. 







1 P.M. 



564 



N.W. 1 



69 



9 



Very clear 



(150). Cloud /„-. 







4 P.M. 



2,400 



N.W. 2 



67-5 



8-5 



)> 



(150). Cloud \. 







5 P.M. 



1,500 



» 



65 



7-5 



j? 



(100). Cloud \. 







7 P.M. 



1,150 



N.W. 1 



62-5 



6 



>> 



(100). Cloud !,. 







9.30 p.m. 



1,250 



N.W. 0-5 



58-5 



4 



Clear 



(70). Clouded over, 

 very thin. 



1) 



4 



9 A.M. 



1,050 



E. 0-2 



63 



)> 



Thickish 



(16). Cloud I, thin. 







10 A.M. 



950 



>> 



66 



6 



)> 



(20). Cloud |, thin. 







11 A.M. 



950 



E. 05 



64 



5-5 



>> 



(20). Cloud J, thin. 







1 P.M. 



875 



>> 



67 



7 



Medium 



(40). Cloud i,'thin;N.E. 

 wind on Loch Linnhe. 







4 P.M. 



635 



>> 



69 



8 



Thickish 



(20). Cloud J. 







7 P.M. 



825 



J? 



66 



6 



)> 



(20). Clouded over. 







9.30 p.m. 



925 



Calm 



63 



5 



jj 



(14). Clouded over. 



>) 



5 



9 A.M. 



544 



E. 1 



Gl 



)> 



?» 



(28). Cloud -I, thin. 







10 A.M. 



511 



)> 



65 



8 



Medium 



(50). Cloud T \. 







12 



935 



E. 0-5 



67 



7 



Clear 



(60). Cloudless. 







1 P.M. 



1,200 



)) 



70-5 



9 



)' 



(80), Cloud!, very thin. 







2.30 p.m. 



1,100 



>> 



715 



9-5 



)? 



(100). Cloudless. 







4 p.m. 



2,400 



S.W. 0-2 



73 



10 



3) 



)> i> 



