684 



MR JOHN AITKEN ON THE NUMBER OF DUST PARTICLES IN THE 



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



Place. 



HYfcKES 



Cannes . 

 Mentone , 



San Remo 

 Milan . 



Bellagio . 



Baveno 



Date. 



March 



25 



27 



28 



29 



31 



April 



1 



10 



11 

 12 

 14 

 15 

 17 



18 

 19 

 21 



22 

 23 

 24 

 25 



29 



May 

 1 



Hour. 



3.30 p.m. 



4 P.M. 



3 P.M. 



4 r.M. 



3 P.M. 



3 P.M. 



4 P.M. 



4 P.M. 



3 P.M. 



4 P.M. 



11 A.M. 



3 P.M. 



4 P.M. 



4 P.M. 

 3 P.M. 



11 A.M. 



4.30 p.m. 



11 A.M. 



5 P.M. 

 10 A.M. 



10 A.M. 



3 P.M. 



4 P.M. 

 10 A.M. 



5 P.M. 



12 

 2.30 p.m. 



4 P.M. 



2 P.M. 

 4 P.M. 



2 P.M. 

 4 P.M. 



4 P.M. 

 2 P.M. 



3.30 p.m. 

 3.35 p.m. 

 4.15 p.m. 



6 p.m. 

 3.30 p.m. 

 3.45 p.m. 



4 P.M. 





fe 



Ph 



4,G00 

 1,075 

 1,900 

 1,025 

 1,525 



31,250 



11,400 



1,085 



1,062 

 6,750 



1,800 



875 

 1,900 

 2,050 

 1,850 

 1,675 



975 

 1,025 



698 

 100,000 



150,000 

 3,300 

 7,100 

 4,300 

 3,600 

 4,050 

 3,500 

 1,850 



2,800 

 2,300 



6,400 

 4,500 



3,050 

 5,100 

 2,600 

 1,900 

 1,525 

 3,350 

 2,500 

 2,250 

 1,675 



Wind. £* B 



W. 2 



E. 0-2 



E. 3 



N.E. 1 



W. 1 



E.S.E. 0-5 



S.W. 1 



S.W. 3 



E.S.E. 1 



S.E. 2 



S.W. 1 



S.W. 1 



S. 0-2 



S.E. 1 



S.S.E. 0-5 



S.E. 0-2 



S.E. 0-5 



S.E. 0-2 



S.W. 1 



S. 1 



S.S.W. 1 



W. 0-5 



S.S.W. 1 



S.E. 0-5 



N.E 0-2 



S.E. 1 

 E. 0-2 



S.E. 0-5 

 N.E. 0-2 



N. 0-2 



S.E. 0-2 



E. 0-5 



S.E. 1 

 N.E. 0-5 



E.'b-5 



(55 





& ® 



T3 



S £ 



s 



<D 





H 



a 



58 



7-5 



52 



4 



54 



8 



50 



5 



51 



3 



59 



8-5 



59 



10 



62 



8 



60 



9-5 



61 



8-5 



65 



14 



60 



10 



61-5 



6-5 



67 



10 



61 



9 



63 



5 



60 



3 



64 



5 



)) 



91 



69 



n 



66 



14 



55 



6 



69-5 



13 



67 



8 



99 



>) 



59 



4-5 



69-5 



10-5 



61-5 



8-5 



66-5 



9-5 



59-5 



6 



64 



5-5 



70 



14 



69 



19 



5) 



!) 



67-5 



15-5 



69 



14-5 



71 



19 



70-5 



18-5 



70 



18 



State of 

 the Air. 



Medium 



Clear 



Very clear 



Medium 



Clear 



)> 

 Medium 



Clear 

 Thick 



Thickish 



Medium 



Thickish 



Very clear 



Remarks. 



Observed on Fenouillet. 



Observed on Fenouillet ; 



been rain. 

 Observed on Fenouillet ; 



air from Toulon. 

 Observed on Fenouillet; 



air from Hyeres ; 



numbers variable. 

 Observed at Presqu' He 



de Gien. 

 Observed on Fenouillet. 

 Observed on Fenouillet ; 



air from Hyeres ; 



numbers variable. 

 Air coming direct from 



Mediterranean. 

 At Cape Martin. 



At Red Rocks. 

 At Cape Martin. 

 On breakwater. 

 On shore of west bay. 



>> >> 



On breakwater; no spray. 

 On topof spire of Cathe- 

 dral. 



Top of Serbelloni. 



At the lake-side. 



On hill-side 1500 feet 

 up ; showers distant. 



At lake-side. 



On hill-side 1500 feet 

 up ; air oil* lake. 



At lake-side. 



On hill-side 1500 feet 

 up ; air off lake. 



j) >> 



At lake-side. 

 On hill-side 1500 feet up. 



Onnill-side2000feetup. 



At lake-side. 



On hill-side 1500 feet up. 



