On Liquid Manure. 531 



liquid and that from Badminton or Westonbirt. In the first 

 place, it will be noticed that the proportion of solid matter in the 

 Cirencester liquid is very much smaller than in the other two. 

 In that from Badminton we have almost exactly 5 times as much 

 solid matter as in that from Cirencester, and in that from Weston- 

 birt about 3|- times as much. 



In the next place, it will strike any one who carefully com- 

 pares these analytical results that, notwithstanding the much 

 larger proportion of water in the Cirencester liquid, it contained 

 more than double the amount of ammonia which was found in 

 the sample from Badminton. 



Thus the proportion of ammonia which is driven out on boil- 

 ing amounts in the Badminton liquid to only 11*41 grains per 

 imperial gallon, whilst in that from Cirencester there ai'e 22964 

 grains of such ammonia per gallon. 



I have observed already that the Badminton liquid has evidently 

 lost ammonia by long keeping ; while injurious evaporation of 

 this kind does not appear to have deteriorated the contents of 

 the Cii'encester tank. Again, it will be seen that even the total 

 amount of nitrogen is somewhat larger in the Cirencester than 

 in the Badminton sample. In the former we have 18'911 

 grains of nitrogen, equal to 22'964 of ammonia, present in the 

 state of volatile compounds of ammonia, and 3'033 of nitrogen, 

 equal to 3*683 of ammonia, present in the state of nitrog:enised 

 organic matters and fixed salts of ammonia, or together 21*944 

 per cent, of nitrogen, corresponding: to 26*647 of ammonia; 

 whilst in the latter we have only 9*40 grains of nitrogen in the 

 state of volatile compounds of ammonia, corresponding to 11*41 

 grains of ammonia, and 8*98 grains of nitrogen, in the shape of 

 nitrogenised organic matters and fixed ammoniacal salts, or 

 together 1838 of nitrogen, which is equal to 22*31 grains of 

 ammonia. 



The composition of the ash of the Cirencester liquid manure 

 also offers some points of interest, which, however, 1 shall con- 

 sider after having given some particulars respecting the charac- 

 ters of the contents of our tank in 1858. 



4. — Liquid Manure from Royal Ar/ricultural College Farm, 

 Cirencester. Collected in 1858. 



I was anxious to ascertain whether or not the contents of our 

 tank varied much at different periods, and for this purpose 

 pumped up a quantity of liquid sufhcient for examination in 

 1858. 



The physical characters of the tank-liquid were the same as in 

 1857. It was allowed to subside for some days, and was per- 

 fectly clear when submitted to analysis. 



