Experiments upon Swedes. 181 



Plot XIX. — Manured with 4 cwt. of Poudrette de Bondy, or 



dried night-soil from Paris : — 



Produce .. 8 tons 14 cwt. 1 qr. 25 lbs. 

 Increase .. 2 tons 2 cwt. 3 qrs. 1 lb. 



A sample of this manure, on analysis, yielded the following 

 xesults : — 



Water 25-20 



* Organic matter 26"14 



Phosphates 17'17 



Sulphate of lime 4*21 



Carbonate of lime 3'09 



Alkaline salts 3-22 



Magnesia 1'78 



Insoluble silicions matter (sand) 18'61 



99-42 



* Containing nitrogen 3*35 



Equal to ammonia 4*07 



It will be seen, that the Paris night-soil manure contains a 

 good deal of phosphates, as well as nitrogenized matters. It 

 as far superior to any description of night-soil manufactured in 

 this country. 



In its practical effects upon the turnip-crop in these experi- 

 ments, it proved equal to wool-manure and Peruvian guano, but 

 it does not follow from this, that its commercial value is equal to 

 that of Peruvian guano. 



Plot XX. — Manured with 3 cwt. of Peruvian guano : — 



Produce .. 8 tons 18 cwt. 1 qr. 25 lbs. 

 Increase .. 2 tons 6 cwt. 3 qrs. 1 lb. 



Composition : 



Moisture 18*50 



+ Organic matter and ammoniacal salts .. .. 52-33 



Phosphate of lime and magnesia 21*60 



* Alkaline salts 6*41 



Insoluble silicious matter I'lO 



100-00 



* Containing phosphoric acid 1 * 46 



f Containing nitrogen 14'16 



Equal to ammonia 17* 19 



The analysis shows that the guano used in the experiment was 

 genuine Peruvian guano of superior quality. 



The turnips on this plot were for a long time decidedly in- 

 'ferior to the superphosphate turnips. But towards the middle of 

 September the plants took a start, and the crop in Plot XX. 

 then appeared the best in the field, so far as the tops were 

 considered. Shortly before the time when the turnips were 



