MANUEE FEOM ANIT^IAL WASTE. 



267 



the approximate efficiency values of these maiuufcs, nitrate being 

 taken as 100 :— 



TABLE LXXV.-SHOWING AGEICULTURAL VALUE OF NITKCGENOUS 



MANURES (NITRATE). 

 Dried bood TO 



Horn du^t . 



Fish guano 



Castor meal 



Meat meal . 



Bremen poiidrette 



Ground bones 



Krottnauer organic manure 



Blankenburg manure . 



Distillery spent wash-salts 



Wool dust . 



Concentrated cattle manure 



Ground leather . 



70 

 00 

 60 

 60 

 55 

 55 

 45 

 43 

 40 

 25 

 20 

 10 



The vahie of the dissolved organic manure is 23 per cent of that 

 of the nitrate. Popp has, moieover, lemaiked that in every case 

 the organic nitrogen is first converted into ammonia ; he was not 

 able to determine the effect of the lime. Complete conversion of 

 organic nitrogen into nitric acid did not occur in any case. In the 

 most favourable instance of 100 parts of organic nitrogen, 72 parts 

 were converted into nitric acid ; that is the case especially with 

 dried blood. The nitrogen of horn dust was converted in the pro- 

 portion of about 57 per cent, and the nitrogenized organic manure 

 in the proportion of 21 per cent. Horn dust thus acted more 

 slowly than dried blcod, and the nitrogenized organic manure about 

 half as quickly. Neither in this case was the effect of the lime in 

 the conversion observed. In conclusion, Popp has calculated the 

 value of the nitrogenized organic manure compared with that of 

 nitrate of soda, the latter calculated at 3525 francs, all expenses 

 included. He values 1 kg. of nitrogen in such organic manures 

 as follows : — 



TABLE LXXVL— SHOWING COMPARATIVE AGRICULTURAL MONEY 

 VALUE OF NITROGENOUS MANURE IN FRANCS PER KILO- 

 GRAMME. 



Dried blood ..... 

 Horn dust ..... 

 Fish guano ..... 

 Castor meal . . . 

 Meat meal ..... 

 Bremen poudrette ... 

 Bone dust manure 

 Krottnauer organic mani.re . 

 Molasses salts .... 

 Dissolved nitrogenized organic manure 

 Lutzel guano .... 



Wool dust . . . . - 



Concentrated cattle manure . 

 Ground leather .... 



Francs. 

 1-4 

 1-4 

 1-2 

 1-2 

 1-2 

 1-1 

 1-1 

 0-9 

 0-8 

 0-4 

 0-7 

 0-5 

 0-4 

 0-2 



