.')96 Addition to Mr. Hannams Paper on Sulphuric Acid. 
his intention of preparing and dispensing to the public the bones 
in a state of solution. Should Mr.'Tennant carry out this inten- 
tion, the south and west of Scotland may command a supply with- 
out inconvenience, and, I have no doubt, at an economical rate. 
The means of distribution have also been considered ; for ex- 
ample, the model of an efficient drill-cart for manures in solution 
w as exhibited at the late meeting of the Aberdeen Agricultural 
Society. 
On both points, however, the methods adopted by Mr. Ten- 
nant of Shields bear, and are worthy of attention, not only because 
they are matters of extensive experience, and refer, to use Mr. 
Tennant's own language, to "an easy icay of it," but because 
they point out a " way " which may be adopted in the event of 
the liquid form of application not being attainable, or in case of 
the compact form being preferred. 
Mr. Tennant's practice is as follows*. — "I put," says he, "25 
bushels into three old boilers (of which every farm here has a 
supply), and next pour in 2 bottles of acid of about 170 lbs. each, 
and 36 Scotch pints (18 imperial gallons) of boiling water into 
each boiler. It boils away at a great rate for some time, and in 
a day or two we empty the boilers into two carts of light mould, 
and turn the mixture over. At this stage the bones are only par- 
tially dissolved, but they heat and decompose in the heap, after 
being turned over three or four times; and in the course of seven 
or eight weeks the compost becomes dry, and breaks down with a 
shovel in a state fit for spreading with the hand in the drill." 
