Composition and Practical Value of Native Guano. 421 
loss of ammonia, and dried in tlie air, contained tlie following 
ingredients : — 
*Ori:anic matter 3-i'27 
Ammonia "16 
fPhosphovic acid 1"98 
Clay ami other useless mineral matters .. .. 5G"13 
AVatcr 7-46 
100-00 
*Containing nitrogen I'Sf) 
Equal to ammonia 1'88 
fEqual to tribasie phosphate of lime (bone-"! ^.g, 
phosphate / 
Adding the small amount of ready formed ammonia ('16) to the 
ammonia which Avill be finally yielded by the nitrogenous 
matter of this sewage manure we obtain 2*04 per cent., or just 
about one-half of the amount of ammonia which the Native 
Guano, as sold to the farmers, is represented to contain in the 
analysis printed in the Company's circular. Dr. Frankland 
found an amount of phosphoric acid in the dried Leamington 
sewage mud which is equal to 4*32 per cent, of phosphate of lime. 
The printed analysis of the Native Guano Company repre- 
sents the manure as sold to the farmer to contain 9 '6, or more 
than twice as much phosphate of lime as found by Dr. Frank- 
land in the dried Leamington sewage mud. 
The differences in the composition of the two analyses just 
quoted are too great to be ascribed to mere accidental cir- 
cumstances. Sewage deposits, as shown by the Leamington 
manure in a dried state, unless fortified by guano, sulphate of 
ammonia, dry blood, or other substances rich in nitrogen, 
rarely yield more than 1^ to 2 per cent, of ammonia on decom- 
position. Presuming the analysis which is put forward by the 
Native Guano Company to be correct, it would appear that 
before the dried sewage mud obtained from the subsidence tank 
at Leamington is sold to the farmers it is fortified by some kind 
of nitrogenous or ammoniacal compound or the other. Con- 
■sidering that the native guano is sold at 5/. per ton the managers 
of the Native Guano Company can well afford to give to their 
customers a little more fertilising matter than they are likely to 
get in the genuine or unmixed dried sewage mud which is 
obtained by the ABC process. 
During the last few months five different samples of native 
guano have been sent to me by as many different parties, who, 
before buying any more of the Leamington ABC Manure, 
%vished to have an opinion of its value. 
Having had a good opportunit}' of becoming acquainted with 
the composition and value of some of the manure which actually 
