Soluhility of Phosphatic Materials. 181 
Composition of Pure Bone-ash (from Shanh-hone of a Horse). 
♦Phosphoric acid 40-29 
Lime 55-01 
Ma<incsia '84: 
Potash -25 
Soila '03 
Carbonic acid 2-99 
Sulphnric acid traces 
Chlorine traces 
99-41 
*Equal to tribasic pliosphato of lime (bone-carth) 87-29 
Amount of Phosphate of Lime dissolved by Distilled Water from the 
following matenals : — 
111 1 Pint. 
Grains. 
Calculated 
I'lT Gallon. 
Grains. 
Pure bone-ash (from a very 
, 1st Experiment 
2nd 
3rd 
4th 
.. -13 .. 
.. -17 .. 
.. -14 .. 
.. -15 .. 
•147 .. 
.. 1^04 
.. 1-36 
.. 112 
.. 1-20 
.. 1^18 
Commercial sample of American 
1st ExjDcriment 
2nd „ 
Mean 
.. -25 .. 
.. -22 .. 
-235 .. 
.. 2^00 ; 
.. 1^76 
.. 1^88 
Peruvian p;uano ■ 
1st Experiment 
2nd 
.. -30 .. 
.. -33 .. 
.. :315 .. 
.. 2^40 
.. 2-G4 
. 2^52 
Konria mooria guano 
1st Experiment 
2nd 
Mean 
.. -15 .. 
.. -18 .. 
-165 .. 
.. 1-20 
. 1-44 
.. r32 
Somhrcro phosphate 
1st Experiment 
2nd 
.. -10 .. 
.. -11 .. 
■105 .. 
•80 
. •ss 
. ^84 , 
Monies' Island phosphate 
1st Experiment 
2nd 
Mean 
.. -13 .. 
.. -12 .. 
-125 .. 
1^04 
. -96 
. 1-00 
1st Experiment 
2nd „ 
Mean 
., -09 .. 
.. -07 .. 
-08 .. 
. ^72 
. -56 
. -64 
Camhridgesbire coprolites 
1st Experiment 
2nd „ 
Mean 
.. -08 .. 
.. -07 .. . 
•075 .. 
. -64 
•50 
•GO ; 
Estramadura phosphorite ..' 
1st Experiment 
2nd 
.. •lo .. 
.. •lo .. 
. •lo . 
•10 
1st Experiment 
2nd 
Mean 
.. •or; .. 
.. •OS .. . 
.. ^055 .. . 
. ^48 
. -4:0 
. -u 
It will be seen that the earthy phosphates in Peruvian guano 
are more soluble in water than the phosphates in bone-ash ; these, 
