422 Composition and Practical Value of Native Guano. 
found its way into the hands of the consumers, I deem it my 
duty, in the interest of the agricultural public, to lay these 
analyses before the readers of the ' Journal of the Royal 
Agricultural Society.' 
The analytical results are embodied in the subjoined Table: — 
Composition of Five Samples of Native Guano, prepared by the 
ABC Sewage j^rocess of the Native Guano Company. 
No. 1. 
No. 2. 
No. 3. 
No. 4. 
No. 5. 
Water 
Tribasic phosphate of lime"! 
Carbonate and a little sulphate) 
Magnesia and alkaline salts .. 
Oxide of iron and alumina 
Insoluble siliceous matter (clay"! 
*Containing nitrogen .. 
Equal to ammouia 
7*91 
19- 40 
2-40 
20- 93 
2-92 
9-78 
37-GG 
6-12 
22-45 
2- 81 
6-37 
3 - .56 
6-59 
52-10 
12- 14 
9-04 
2- 57 
4-71 
3- 32 
7-80 
60-42 
8- 84 
12-63 
4-27 
4-91 
4-OG 
9- 01 
56-28 
6- 30 
14-55 
2'48 
3-53 
5-59 
7- 30 
60-25 
100-00 
100-00 
100-00 
100-00 
100-00 
•9G 
1-16 
1- 92 
2- 33 
•60 
•73 
•70 
-85 
-67 
•81 
A comparison of the preceding analyses with each other, and 
with the published analysis of the Native Guano Company, 
shows : — 
1. That the native guano prepared by the ABC process has 
a very variable composition, 
2. That especially the proportion of nitrogen varies greatly in 
different samples. The first sample analysed by me, in round 
numbers, contained 1 per cent, of nitrogen, the second 2 per 
cent, and the third, fourth, and fifth from to -^^ of 1 per cent. 
3. That three out of the five samples contained, in round 
numbers, 2\ per cent, of phosphate of lime, one not quite o per 
cent., and the fifth a little over 4|- per cent. 
4. That the proportions of useless insoluble siliceous matter 
(clay and sand, chiefly the latter) in the five samples analysed by 
me varied from 37^ per cent, to 60|- per cent. 
5. That the analysis published in the Company's circular repre- 
sents the manure as sold to the farmers to contain rather more 
than twice as much phosphate of lime as the best of the five 
samples, and nearly 4 times as much as the average amount in 
the four remaining samples, and gives the per centage of nitrogen 
about twice as high as 1 found it to be in the best of the five 
samples, and about 5 times as high as I found it in three out of 
five samples. 
