PhospJiatic Manures for JRool- Crops. 
47 
used — wc find that 24'29 grains, or rather less than two-thirds of 
the total amount of soluble phosphate were absorbed by 12 oz, 
of this red loamy soil alter a lapse of twent}-four hours. The 
remainin<^ liquid was then left in contact with the same soil for 
eight days, and the bottle containing the solution and soil shaken 
up at intervals. At the commencement of this second experi- 
ment the bottle contained besides the soil 9625 grains of water 
and 3G"30 grains of soluble phosphate after the removal of 4'37 
grains in 3500 grains of vrater. After eight days 3500 grains 
of the remaining solution were again drawn off. The proportion 
of bone-earth in this quantity of liquid was now found to weigh 
only 2"45, or at the rate of 6*73 grains for the 9G25 grains of 
water : — 
Auioimt of Lonc-eartli in bottle after 24 horns .. ."G"30 
„ 9625 grains of solution in \ ^ -o 
the bottle / " 
Total amoimt of bone-carth absorbed by 12 ozs. ) on-5- 
of soil after 8 days j-oi 
The remaining 6125 grains of the liquid in the bottle were 
finally left in contact with the same soil for twenty-six days, 
when 3500 grains of liquid were again drawn off, and they were 
found b\- accurate determination to contain only '65 grains of 
bone-earth, an amount equivalent to 1"13 grains in the 6125 
grains of water. 
In the second experiment 2 45 grains of soluble phosphate had 
again been removed in 3500 grains of water ; so that only 33*85 
grains remained, of which S2"72 grains had been absorbed in 
twenty-six daj s by the soil, only 1-13 grains being then left in 
solution. 
Supposing the icJioIe of the solution had teen draiai off in each cf these three 
successive Experiments, it would have contained — 
Grains. 
After 24 hours 10-38 of soluble bonc-carth. 
„ 8 days 9-18 „ 
„ 26 days 2-44 
And the 12 ounces of Soil would have removed from the 40-G7 grains of 
soluLle Bone-earth which icere originally used — 
Grains. 
- After 24 hours 24-29 
„ 8 davs 31-49 
„ 2Gdays 3S-23 
We thus see that in this case the absorption of soluble phos- 
phates was not complete even after twenty-six days ; and that a 
heavy shower of rain falling within twenty-four hours of the 
application of superphosphates rich in soluble phosphates, would 
