Artificial Manures for Swedes. 13 



On analysis the ground coprolites were found to contain in 

 100 parts- 

 Hygroscopic water 1'20 



Water of combination, and a trace 



of organic matter 3*20 



Oxides of iron and alumina . . . 4 '84 



Lime , 39*81 



Magnesia 5 '68 



Phosphoric acid 23*48 equal to 47 '82 of bone earth. 



Carbonic acid 5 '82 



Insoluble siliceous matter . . . 12*56 

 Alkalies, sulphuric acid, and loss . 3' 41 



100*00 



The price of the dissolved coprolites made on the premises 

 was 47. per ton. At the present prices of the raw coprolites, 

 the dissolved article would be more expensive. 



Plot III. Manured with 100 Ibs. of bone-dust, or 7 cwts. and 16 Ibs. per 



acre. 

 Cost of manure 5s., or 2/. per acre. 



The swedes on this plot looked healthy, but, it struck me, 

 rather unequal. A distinct difference in the average size of the 

 roots, as compared with the two preceding plots, soon became 

 apparent to the eye when the root began to swell. On analysis 

 the bone-dust was found to contain in 100 parts 



Moisture 18-12 



Organic matters (gelatine and fat) 29 * 29 



Phosphates of lime and magnesia (bone-earth) 44*22 



Carbonate of lime 5 '49 



Alkaline salts (chiefly common salt) ........ 1*49 



Sand 1*39 



100-00 



Containing nitrogen . . 4*28 



equal to 

 Ammonia . 5.23 



Previous to crushing they had undergone no preparation what- 

 ever, and contained consequently a great deal of fat, which cir- 

 cumstance explains their slow action. 2s. more per quarter was 

 paid for obtaining the bone-dust in a finer state than it is usually 

 sold. A bushel on an average weighed 44 Ibs., and the price 

 per ton was 5/. 12s. 



Plot IV. Manured with 93 Ibs. of home-made superphosphate of lime, or 



at the rate of 6 cwts. and 72 Ibs. per acre. 

 Cost of manure 5s., or 21. per acre. 



The seed came up well, but at the first stage of growth the 

 swedes sowed with guano appeared somewhat better. At a 

 later period the difference in the appearance of these two plots 

 was less striking ; and when the bulbs began to swell, it was 



