92 Dr. E. Angus Smith, [March 25, 



Manchester, All Saints, E. wind, above 70° Fahr.( 1 6 expts.) 58 • 4 



„ „ below „ (21 experiments) 48 '0 



„ In a house kept rather close 60*7 



In a pigstye uncovered 109*7 



Thames at City, no odour perceived after the warmest 



weatherof 1858 58*4 



Thames at Lambeth 43*2 



„ Waterloo Bridge 43*2 



Xondon in warm weather (six experiments) . . . . 29 * 2 



„ after a thunderstorm 12'3 



In the fields S. of Manchester 13 '7 



„ N. of Highgate, wind from London . . 12*3 



Fields during warm weather in N. Italy Q'6 



Moist fields near Milan 18*1 



Open sea, calm (German Ocean, 60 miles from Yarmouth) 3 * 3 



Hospice of St. Bernard, in a fog 2*8 



N. Lancashire about same 



Forest at Chamouni 2*8 



Lake Lucerne 1 ' 4 



The first experiments undertaken were in Manchester, and the 

 average amount obtained was in the city about 50, gradually diminish- 

 ing in moving towards the country until it was found in the fields at 

 13 ; on passing a sewer stream about a mile from the outskirts, the 

 amount rose to 83. The atmosphere on the Thames was not measured 

 whilst at its worst, but immediately afterwards ; when however it had 

 ceased to affect the senses of most persons at least, the amount was very 

 high, viz., 58. I was anxious to know how far the Thames affected 

 the atmosphere of London, and tried some experiments : the result 

 was that the influence appeared to cease almost immediately ; the fact 

 of a block of houses standing in the way was enough to prevent the 

 influence ; when at the worst this may not have been the case ; to 

 arrive at the other side of the block, the vapour would generally 

 require to rise high, so that it would become mixed with a great deal 

 of air. The amount obtained in a few trials in the streets of London 

 was 22 to 34 ; going on to Highgate, the numbers sank from 33 to 24 ; 

 on descending the north side of Highgate-hill a distinct change was 

 perceived, the numbers being 18; the wind meantime was blowing 

 from the city : the few experiments made in the fields in summer gave 

 10 to 12. The numbers 6 to 18 were obtained in Switzerland 

 and Lombardy. The moist fields around Milan gave 18; when the 

 water passes off the rice fields, producing the unhealthy season, I do 

 not doubt that the amount will be much higher. It was not convenient 

 for me to stay, nor to go farther to places distinctly infected with mal- 

 aria. I was desirous of trying it in some of the hovels of the Vallois 

 and the Val d'Aosta, but the weather being fine, and the people living 

 much out of doors, the enquiry was not encouraging. The few ex- 

 periments made did not give very striking results, whereas the lower 

 parts of our own towns gave results most decided ; I imagine the cause 



