on Permanent Meadoto Land. 
407 
specimens so clearly indicate the comparative conditions of 
elaboration and maturation merely, as they generally do in the 
case of professedly ripened produce. 
Constituents of the Ash. 
The influence of the artificial supply of mineral constituents 
upon the total amount of them assimilated by the crop over a 
given area of land, has been illustrated in Part II. of our Report. 
The influence of such supply upon their percentage in the dry 
substance of the produce has now been shown. By the aid of 
complete analyses of the ashes of the produce of some of the ex- 
perimental plots, further light will be thrown on the effects of a 
liberal provision of mineral constituents in the soil on the mineral 
composition of the crop. 
In the first Division of Table XIII. is given the percentage 
composition of the ashes from the produce of five of the experi- 
mental plots ; in the second Division of the Table the amounts of 
each of the several mineral constituents in the average annual total 
produce per acre on each of the plots ; and in the third Division 
the increase in the amounts of the several mineral constituents 
obtained, per acre, in the crop, under the influence of the different 
manures. 
The plots selected were — the unmanured ; the one with am- 
moniacal salts alone ; the one with mixed mineral manure alone ; 
that with the mixed mineral manure and the smaller amount of 
ammoniacal salts ; and that with the mixed mineral manure and 
the larger, or double amount of ammoniacal salts. In the 
case of each of the 5 plots an equal mixture of the ash of its 
produce in each of the three years was operated upon. In this 
way the average effect of each condition of manuring upon the 
mineral composition of the crop is taken over a three-years' 
continuance of that condition. 
The ash-analyses were made in the Rothamsted laboratory, by 
Mr. Robert Warington, jun. ; and we are glad to take this oppor- 
tunity of expressing our full confidence in the accuracy of his results. 
The facts which the figures in the Table disclose are very 
interesting. But our comments on them must be very brief, and 
be confined to their practical bearings. 
It has been shown in Parts I. and III. of our Paper, that 
ammoniacal salts alone gave an almost entirely Graminaceous 
produce, but that that produce was stunted, very dark green, 
leafy, and not very much more in weight per acre than that without 
manure. Mineral manures alone, on the other hand, increased 
the weight of produce somewhat more than the ammoniacal salts 
alone ; but the increase in this case was chiefly Leguminous 
herbage — the Graminaceous herbage benefiting but little by this 
