To the main analysis G,000 -rains of soil were treated witli 1 

 ti-e of hydrochloric ;icid to which after -i8 hours 50000 of water 

 as added, so that of the solution 2r)0cc represented 1,000 grains 

 f soil. The silicates insoluble in hydrochloric acid were checked 



cid side by side with the main <juantity. Nitroijen was deter- 



"ere souglit for by treatmejit with a coj^per zinc couple and 



The analyses of the two soils are as follows in air dried soil :— 



