IO 
COMPARATIVE EXPERIMENTS ON THE EFFECT OF 
crop has shorter roots and ripens (in May) before the high tem¬ 
perature of the summer months carries the decomposition of the 
phosphates in the soil so far as during the growth of rice (July to 
October) ; yet these conditions did not specially affect any of the 
above fertilizers, but acted on all alike and thus did not impair 
the proportionality of the two series of figures given for the relative 
manurial effect. With the steamed bone dust and precipitated 
calcium phosphate the case is different. The former manure 
acted better on the dry land, probably because in the porous soil 
to which the oxygen of the air has easy access, the gelatogenous 
bone tissue previously steamed under a high pressure is more 
readily decomposed than the original bone tissue without previous 
gelatinization ; comparative experiments on the effect of the nitro¬ 
gen of crude and steamed bone manure made by us on the same 
dry field, proved indeed, that the nitrogen of the steamed bone 
dust also acts much better than that of the crude one, while in the 
irrigated paddy soil the two had the same effect. The superior 
action of the precipitated calcium phosphate on the paddy rice is 
certainly due to the better distribution which can be given to it in 
the soft muddy paddy soil. 
In order to determine further the after-action of the various 
phosphates we mixed the soil of each plot carefully with the roots 
and stubble of the barley and sowed on the ist of June, 1891, 
millet (Panicum crus corvi) after applying on the previous day 50 
kilograms, of nitrogen as ammonium sulphate to all plots alike. 
The germination was quite regular, but the subsequent growth, 
though not disturbed by the weather or any other external cause, 
was not so vigorous as we had expected. On the 25th of August, 
when the millet was nearly ripe, it was cut, dried, weighed, and 
analyzed by Mr. T Yamada, a post-graduate of the college. 
The results were was follows (per plot) ; 
