1 The problem WM developed and the exprimemta were made by D. V. Bal end the interpmtstion of the d t i n is e aonfoint produot&~u. Mr Bal t a b thin opportanity to exprum hb ptitude to Sir John Rume.ll for having dlowed bim to work at thi~ He is elso indebtad to the Lead Addnbtmtion, cslntrsl FVovinca, India, end to IIbr F. J. Plymen and h IX. E. h t t for making tlte visit t o Ilofhmsted pcrSible.

No abstract

In determining the nitrogen content of the heavy black cotton soil of the Central Provinces, India, by the Kjeldahl process it is important that the determinations be carried out on moist and not on air-dried soil. These soils apparently contain a cementing material probably containing iron which is insoluble in concentrated sulphuric acid and protects organic matter in the interior of the compound particles from the action of the acid.It may be that these soils are peculiar in this respect, but it would seem of importance that other workers should take into account the possibility of error in the estimation of nitrogen when using air-dry soils.In conclusion it is with great pleasure that I acknowledge my indebtedness to Mr F. J. Plymen and Dr H. E. Annett for their valuable suggestions and advice during the course of this work.

No abstract

No abstract