THE TROPICAL AGRICULTURIST. [Feb. i. 1894. 
obtained in rjiiantity, would be a suitable material 
to add to a plioKpiiatic manure : — 
Amilysin of Volcanic As/iea or Siiblhiitite from 
Montit i esiiviiin. 
Potas.siuiii .Hulplmte 
Sodium .sulphate 
Sodium chloride 
Peroxide of iron 
Aluminum sulphate 
Manganene nulphate 
Copper Huljihate 
Calcium Hulphate 
Magnesium sulphate 
Silica 
Water 
Less 
l>er cent. 
. 40 -TO 
. 22-«7 
7 "ii ") 
. i.'-.-4;i 
4-34 
•14 
1 •.-)9 
■6S 
■96 
■42 
4-41 
•8.> 
100-00 
NITROGENOUS AND PHOSPHAIIC 
MANUL'K.'^. 
Amongst the more important manures that 
are valued l)otli for their nitrogen and phosplioriir 
acid, may be enumerated crushed bones, (ish 
manures, guano and nitrogenous superitlioMiiliateH. 
Crushed Bones. 
The value of cruslied bones for agricultural 
purposes depends both up«n tlieir chemical com- 
position, and also upon the state of division to 
wiiich they have been reduce<l- The liner, the 
state of division, the more rapidly does lione 
become decomposed in the soil, ami tiie greater 
is its value. Dillerences in the state of division 
are distinguished by the names Ixuie dust, bone 
meal, bone flour. 
In making a mechanical analysis of crushed 
bones, Krocker uses three sieves. What i)asscs 
through No. 1 sieve with 4,000 meshes to the 
square inch is termed veri/ fine. 
What passes through sieve No. 2 with 2,000 
meshes to the square inch is termed fine. 
What passes through sieve No. 3 witli 1,000 
meshes to tiie square inch is terme<l tolciahh/ fine. 
Krocker gives the following as the average 
of a large number of analyses of bone dust. 1 
quote from Dr. Frankland's work on "Agricul- 
tural Analyses :" — 
A. Chemical Composition. (Krockkr. ) 
Steamed, 
per cent. 
Unsteamed. 
per cent. 
Moisture 
5-30 
7 -.50 
Organic matter 
33-40 
38-00 
Phosphoric acid 
22-80 
19-50 
Lime 
27-70 
24-20 
Carbonic acid 
3-80 
4-10 
Ferric oxide ... 
-90 
1-20 
Magnesia alkalies 1 
Sulphuric acid &c. / 
2-50 
2-00 
Insoluble matters 
3-80 
3-50 
100-00 
100-00 
Nitrogen 
3-80 
4 05 
B. Mechanical Composition. 
I. Very fine ... 
45 
56 
65 
75 
20 
31 
35 
IL Fine 
12 
20 
15 
12 
8 
9 
15 
III. Tolerablyfine 
16 
18 
12 
9 
14 
18 
14 
IV. Coarse 
27 
6 
8 
4 
58 
42 
36 
100 
100 
loo 
100 
100 
100 
100 
Tiie following repreuentM the colu)>o^itiuu of 
number of samjiles of lx»ne dust submitted t 
nie for analysis : — 
V 
I 
? S 5< 3 
g Ct « 
— « IN « 
3 ic 0 1- « tr 
© © -rr 
as 4i — ^ ^ 
— 6» C-i « 
1 ?S'©S 
2 ^ ?; S n S 
oc c; T> — n to 
■Ji (M n 
i '-: tis 
- 
"N © <>» or '-C 
W 0 is — 1 - « 
io -r ~ a> t '-i 61 
0< Oi 04 — 
5 s « S 
n t^ax 3' © 
1 - X ri © I - 
Oi 01 — i CI 
5i 01 « 
5c ■>»• 0; 
W SB 7" f> <X 
ao iH 
? ""T -ii to 
S « ^ OJ 
^1 IN •* 00 1 - 1 
0> us 06 ?l 'Tl I 
*l« « 1 
si 
q; - - d , Oi 
^ 2 'f •= 
•2 - — s o ^ 
.5 <i 2E 2 tir='c 
:2 
60 • <-> 
c 
;5 -5 S 
■Si's 
S J; 
i H 
ir 
= ■=- 1 
£ 5 
~ 
■! 
E i" = 
i « 
c S i: 
= - 5 
= = " 
feu « 
* is 
a. > 
The fidlowing is the analysis of a sample of 
iKtue meal prepared in Colomlvi 
Anali/.six oj Bonr Mitil. 
Moisture 
• Organic matter ... 
(■ Phosphoric acid ... 
Lime 
Magnesia alkalies, carlK>nic acid &o. 6-27 
Insoluble matter ... ... 4-.50 
\tfr cent. 
7-70' 
29-50 
22-63 
29-40 
ir»o-oo 
3- .-)0 
4- 25 
49 -.54 
• C^ontaining nitrogen 
Equal to ammonia 
t Equal to tricalcic pliospliate 
The mechanical condition of this .sample of 
bone meal Avas such that 96 per cent passed 
through a sieve having 17 meshes to the lineal 
inch, and fully 70 per cent passed through a 
sieve having 30 meshes to the lineal inch. 
No sample of the finest form of crustied 
bones, viz. , bone-flour has as yet been submitted 
to me for analysis. According to the lat« 
Mr. Pringle, bone Hour should be in such a 
state of division that 9U per cent should pass 
through a sieve having 80 meshes to the lineal 
inches. 
