

DETERMINATIONS OF NITROGEN IN THE SOILS 



OF SOME OP THE 



EXPERIMENTAL FIELDS AT ROTHAMSTED, 



AND THE 



BEARING OF THE RESULTS ON THE QUESTION OF 

 THE SOURCES OF THE NITROGEN OF OUR CROPS. 



BY 



Sir JOHN BENNET LAWES, Bart., LL.D., F.R.S., F.C.S., 



AND 



JOSEPH HENRY GILBERT, Ph.D., F.R.S., F.C.S., F.L.S. 



Bead in the Chemical Section, at the Meeting of the American Association 

 for the Advancement of Science, held at Montreal, in Augrust, 1882. 



{^Reprinted, with corrections, from an uncorrected copy issued hy the Government 

 Department of Agriculture, WashingtonJ] 



LONDON: 

 HARRISON AND SONS, ST. MARTIN'S LANE, 



JPrinte« in ©rbinHrg ia fa pajestg. 



1883. 



