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APPENDIX. 
should be much obliged by any information which 
you may obtain hearing on the practical means of 
improving the sanitary condition of the labouring 
population. 
I remain, Sir, your very obedient servant, 
Edwin Chadwick. 
To N. B. Ward, Esq. 
(i) 
General Board of Health, Whitehall, 
April 1^, 1851. 
My dear Sir, 
If you should have recently made any 
additional observations on the influence of light 
in health or disease, I should be glad if you would 
favour me with it, as it may just now, perhaps, be 
turned to account with reference to the Repeal of 
the Window Duties. 
I am very faithfully yours, 
Southwood Smith. 
To N. B. Ward, Esq. 
(J) 
Clapham Rise, April 3rd , 1851. 
My dear Sir, 
I wish it were in my power to adduce 
any fresh or striking instance of the beneficial 
effects of light. Corroborating proofs of the 
facts already before the public are daily and 
hourly occurring. But what need is there of 
