07G 



MR JOHN AITKEN ON THE NUMBER OF DUST PARTICLES IN THE 



Table II. — The Number of Dust Particles in the Atmosphere for 1892 — continued. 



Place. 



Date. 



Hour. 



Number of 



Particles 



per c.c. 



Wind. 



SB 



H 



a 

 6 



State of 

 the Air. 



Remarks. 





May 

















Bellagio. . 



2 



12 



1,125 



S.W. 0-5 



51 



5 



Clear 



On Serbelloni ; passing 

 showers. 







4.30 p.m. 



2,200 



N.W. 02 



50 



)* 



>> 



On hill-side 1000 feet up. 







6 P.M. 



1,870 



S.W. 1 



51 



45 



Medium 



At the side of the lake ; 

 beginning to rain. 



n 



3 



12.30 p.m. 



2,300 



N. 0-2 



55 



6-5 



j) 



At the side of the lake. 



>> 



4 



9 A.M. 



1,575 



jj 



48 



2 



Very thick 



At the side of the lake ; 

 raining. 







11 A.M. 



1,325 



Calm 



49 



2 



>> 



)> )> 







3 P.M. 



1,750 



Variable 



45 



11 



Medium 



On Serbelloni; trees wet. 







5 P.M. 



1,187 



>> 



44-5 



1-5? 



J? 



» !> 



n 



5 



8 A.M. 



2,200 



Calm 



49 



31 



)3 



At the side of the lake. 







9.30 a.m. 



1,700 



)? 







>) 



On steam-boat on way 

 to Como. 



i 





10.30 A.M. 



1,825 



j> 









!> )! 



Baveno . . 



5 



3.30 p.m. 



2,550 



S.E. 0-2 







Clear 



On steam-boat near 

 Laveno. 







5 p.m. 



2,275 



)» 



58 



6 



J? 



At the side of the lake. 



>) 



6 



3 p.m. 



2,250 



Calm 



59 



3? 



Medium 



At the side of the lake ; 

 passing showers. 







4 P.M. 



1,750 



S.E. 0-2 



62 



10 



Clear 



At the side of the lake. 







6 P.M. 



2,800 



S.E. 0-5 



59 



8-5 



>> 



') )> 



>) 



7 



9 A.M. 



1,600 



N. 2 



48 



9 



)! 



>' i) 







11 A.M. 



2,700 



J? 



>; 



8 



Very clear 



>> >> 







3.30 p.m. 



1,525 



N.W. 0-2 



50 



>) 



)> 



At entrance to Simplon 

 Pass. 



>> 



8 



12.30 p.m. 



2,450 



E. 1 



57-5 



)> 



Clear 



At the side of the lake. 







2.30 p.m. 



1,075 



») 



57 



7 



)> 



)> )> 







5 P.M. 



1,825 



S.S.E. 0-5 



?) 



6 



Very clear 



>; j; 



>> 



9 



12 



3,550 



Calm 



63 



9 



Medium 



)> >) 







2 P.M. 



7,000 



S.E. 0-5 



62-5 



9-5 



Clear 



)> )) 







3.30 p.m. 



2,500 



N. 0-2 



J) 



11-5 



)> 



On hill-side 1200 feet 

 up ; air from lake. 







4 P.M. 



2,150 



>> 



62 



11 



>) 



On hill-side, 1300 feet up. 







5.30 p.m. 



2,250 



E.S.E. 0-2 



63 



8-5 



j) 



At the side of the lake. 



)> 



10 



2 P.M. 



6,900 



Calm 



66 



10-5 



Medium 



j> )> 







4 P.M. 



5,200 



N. 0-2 



65-5 



J J 



)> 



On hill-side 1200 feet up. 







4.30 p.m. 



3,900 



)j 



65 



10 



>» 



On hill-side ; air coming 

 from lake. 







6.30 p.m. 



2,250 



N.W. 1 



J) 



J) 



Clear 



At lake-side. 



>> 



11 



9 A.M. 



3,550 



S.E. 0-2 



59 



6 



Thick 



At lake-side ; rain at 

 different places. 







,3.30 p.m. 



3,500 



N. 0-2 



65 



9 



Clear 



On hill-side 1200 feec 

 up ; air from lake. 







4 P.M. 



875 



W. 1 



66 



11 



n 



On hill-side 1400 feet up; 

 air from mountains. 







4.30 p.m. 



840 



W. 0-5 



63 



10 





On hill-side 1800 feet 1 

 up ; air from moun- 

 tains. 



>> 



12 



3.30 r..M. 



6,100 



E. 0-2 



70 



11-5 



Thickish 



On hill-side 1200 feet 

 up ; thunder to S.E. 

 distant showers. 







4 P.M. 



4,600 



N. 0-2 



66 



10 



j) 



On hill-side 1400 feet 



















up ; air off lake. 



