4 38 On the fertilizing Properties of Manures 



ployed by this philosopher must -be obvious to every one ; 

 for it cannot separate nor ascertain the nature of aboye one- 

 fifth of the inflammable gas from coal, the composition of 

 .the remaining portion being left still undetermined. 



The quantity of gas obtained from one chaldron of Welsh 

 culm, I have reason to state, is sufficient to give a quantity 

 of light equal in intensity to that afforded by 86*9 tallow 

 candles, eight to the pound, burning for 16 hours. The 

 increase of coke in bulk is more than 50 per cent. 



The quantity of tar and other condensable products I 

 have not been able to ascertain, owing to the imperfect 

 state of my apparatus. They appear to amount at least 

 to one-tenth of the coal employed, They will probably be 

 found useful hereafter. For cart grease, or to paint palings, 

 &:c, the tar may certainly be used with advantage. 



With the pungent ammoniacal saline liquor I have made 

 no rustic experiment. 



J.W.Davis. 



Tanbymoore, May 1, 1809. 



LXXVTI. On. the fertilizing Properties of Manures which 

 contain Ammonia. By Mr, William Cox*. 



It is only within the last three weeks or a month that any 

 application was made to me for my opinion on the use of 

 any of the articles produced by Mr. Winsor's apparatus, 

 and therefore I have not had the opportunity of making any 

 experiments with this identical ammoniacal liquor, espe- 

 cially with regard to the use to which I beg leave to state I 

 think it applicable. But it will readily be admitted by 

 several gentlemen present, acquainted with chemistry, that 

 ammonia is a chemical matter, as identical in one situ- 

 ation as in another; and as long as 1 am certain that it is 

 ammonia, it is the same thing if it is produced here or in 

 the North. I was desirous, some years ago, of making am- 

 monia in large quantities, and was of course at some pains 



* From Minutes of Evidence taken before the Committee cf the House of 

 .Commons on the Gas-Light and Coke Company's Bill. 



