Agricultural CheDiistry. — Pig-Feeduuj. 541 



EXPLANATION OF THE DIAGRAMS. 



Diagram I. — Shows the proportions, respectively of Nitrogenous, of Non- 

 nitrogenous, and Total Organic substance, consumed weekly ter 100 lbs. 

 LIVE WEIGHT or AJTiMAL, in the different pens throughout the Three Series 

 of experiments with Pigs.* 



Nitrogenous substance is represented by . . . Black. 



Non-nitrogenous substance Yellow. 



Total organic substance ...... Red. 



For each constituent, the lowest amount of it consumed in any pen throughout 

 tlie Three Series (see Tables XXII., XXIII., XXIV.), is taken as= 100 ; 

 and the proportions of it in each of the other pens, in relation to this mini- 

 mum amount taken as 100, is calculated by Rule of Three. 



Example — Showing the calculations for the three columns oi' Pen 1, Series 1. 

 — The lowest amount of nitrogenous substance consumed weekly, &c., 

 in any pen throughout the Three Series, was 2'91 lbs. in Pen 5, Series I. 

 This, therefore, is taken as the standard by which to compare the amounts 

 of Nitrogenous substance, consumed in each of the other pens, and it is re- 

 presented as 100 ; and, as seen in the Diagram, the column of Nitrogenous 

 substance for Pen 5, Series 1, is coloured (black) only, up to the standard 

 or base line, 100. In Pen 1, Series 1, the amount of Nitrogenous substance 

 consumed weekly, &c., was 8*84 lbs. Therefore, we say : — 



2-91 : 8-84 : : 100 : 304; 



and, consequently, the column of Nitrogenous substance, for Pen 1, Series 1, 

 is coloured (black), up to 304. 



The lowest amount of non-nitrogenous subst^vncz, consumed weekly, &c., 

 was in Pen 1, Series 2 — namely, 14*51 lbs. This, then, is the standard of 

 comparison for all the other pens, as to Non-nitrogenous substance; and the 

 column for that substance, in this Pe?2 1, Series 2, is coloured (yellow), only 

 up to the base line, 100. In Pen 1, Series 1, the amount Non-nitrogenous 

 substance consumed, was 17*63 lbs. ; and to get the proportion of this to the 

 amount in the standard pen, we say : — ■ 



14-51 : 17-63 : ; 100 : 122 5 



and hence, the column for Non-nitrogenous substance, in Pen 1, Series 1, is 

 coloured (yellow), up to 122. 



Lastly ; — the lowest amount of total organic substance consumed, was 

 20*94 in Pen 2, Series 3 ; and, therefore, the column for this substance, 

 for this Pen 2, Series 3, is coloured (red), only up to 100. The amount of 



* Pens 9, 10, and 11 of Series 1, being however excluded, for the reasons 

 which will be understood from the text referring to those Pens. 



