Superphosphate of Lime. 
153 
is concerned ; and there is now the prospect of a good clover 
crop. 
The result of the preceding year having fully satisfied me as 
to the value and economy of vitriolized bones, 1 did not think it 
necessary to test their merits against other manures during the last 
season, particularly as other equally successful experiments had 
been tried and published. 
But wishing to ascertain the most economical proportion of acid 
to be employed, I prepared two lots for a field of 6 acres. In one 
the bone-dust was at the rate of 4 bushels to the acre, and the 
acid one-third ; and in the other the acid was half the weight of 
the bones, but the latter was diminished so as to reduce the cost 
of both lots to the same sum. The mixture in each instance ex- 
tended over half an acre more than was intended, and was mixed 
with equal portions of ashes, viz., about 20 bushels to the acre. 
The swedes came up well, and though attacke<l by the fly, soon 
got but of its way, and proved a very good crop. The average of 
the field, however, was very much reduced by the great quantity 
of hedgerow timber by which it was surrounded, and which 
spread its blighting influence a considerable distance. How- 
ever much these trees might add to the beauty of the landscape, 
they certainly destroyed most effectually the beauty and uni- 
formity of the turnip-crop, and reduced the average of the field 
several tons per acre. A good portion of the field appeared to 
average about 22 tons per acre, and the half where the larger 
quantity of bone-dust with one third its weight of acid was used, 
proved superior to the other, though whether to be attributed to 
the difference in the manure or to the fact of that part of the 
field being somewhat drier, it is difficult to say. 
The field was a clay loam on the London clay, and was par- 
tially drained. 
I also supplied various agriculturists in my neighbourhood 
with vitriolized bones, prepared in the proportion of 4 bushels 
(180 lbs.) of bone-dust, and 60 lbs. of concentrated sulphuric 
acid, which I recommended to be applied to an acre when no 
other manure was employed. The result in nearly every in- 
stance has been decidedly favourable. 
Mr. W. Gater of Westend employed it at the rate of 2 
bushels of bones to the acre in addition to a fair dressing of farm- 
yard dung. On a porti(m of the field the dung was used alone. 
The former was fit for the hoe several days before the latter, 
and on weighing portions of each in January last, there was a su- 
periority of 5 tons to the acre in favour of that portion which had 
received the addition of sulphated bones. 
Mr. J. W. Clark of Timsbury used the manure which I supplied 
him with in the same proportions also in addition to farm-yard 
