96 AGRICULTURAL CHEMISTRY 



both with the metals and with the elements which enter 



into the organic compounds of plant and animal bodies. 



Problem i. How much P 2 O 5 in a ton of bones, 80 per cent. 



Problem 2. How much would the P 2 O 5 in a ton 

 be worth at 5 cents per pound for the P 2 O 5 ? 



= P,0 5 + 2CaO + H 2 O. 



