Addition to Mr. Hannam's Paper on Sulphuric Acid. 595 
per acre, upon 20 carts of dung, for turnips. The remainder of 
the field had 2 cwt of guano, with farm- manure. The crop was 
in both cases good : the dissolved bones having the advantage in 
bulk, and the guano in leaf, of any crop I grew the same year. 
" I also gave 60 bushels of bones dissolved to a fallow-field for 
wheat, and it appeared to do well. The seeds after the wheat 
were, however, the best I ever had. 
" To 12 acres of grass-land I also applied about 2 bushels per 
acre, and it had a good effect, especially upon the clover. 
"This year (1844) I dissolved 600 bushels of bones, and ap- 
plied it to turnips as before, and the bulbs of the turnips grown 
upon it are very large. 
" Had not guano been discovered, the dissolving of bones would 
have been already considered as an invaluable boon. We consider 
guano at 6s. per cwt. and dissolved bones about equally cheap 
as an application ; but think that the bones excel in producing 
bulb." 
To this conclusion of Mr. Tennant's I would only add that, 
should the supply of guano fail, the value of the solution will 
soon be appreciated. Whether or not, however, its value as an 
adjunct, or as a substitute for guano, is equally great. Indeed, 
this I find to be fully allowed in Scotland, where guano has be- 
come so generally, I may say universally, used and esteemed by 
all those who have experimented witti it. Thus, I am told by 
Mr. Campbell, Mr. Finnic of Swanston, and several other emi- 
nent agriculturists, that the only question in the case now is the 
means of rendering the preparation and application of the mixture 
convenient to the farmer generally. 
That this may be done I have already shown, and the more 
easily as it has been proved that it is by no means essential, or 
even necessary, that the tchole of the particles of the bones — 
after being ground pretty fine before the acid is applied — should 
be dissolved ; while the method of applying it is merely a matter 
of ingenuity and mechanical skill, which was never yet found 
wanting when called upon to meet an emergency, or to facilitate 
the application of any useful principle to practical purposes. 
I am fully justified in this opinion, not only by the facts and 
arguments adduced in the foregoing pages, but, so far as relates 
to Scotland — where, I am free to confess, the motto of the farmer 
appears to be " Ready, aye ready," — so speedily is the force of a 
legitimate argument on matters pertaining to improvement Jvlt, 
and the suggestion which it conveys made use of, — by what has 
already been done. 
For instance, as regards the preparation, I am informed by Mr. 
Campbell that Mr. Tennant of St. RoUox, Glasgow, the proprie- 
tor of the largest chemical manufactory in the world, had slated 
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