272 THE KOTHAMSTED EXPEKIMENTS. 



amounts of nitrogenous substance consumed per 100 lb. live- 

 weight per week, as represented in black, in the left-hand 

 division of Diagram I. The lowest amount so consumed 

 throughout the thirty experiments was in pen 5 — and that 

 amount is taken as 100, and as the standard by which to 

 compare the amounts consumed in the other pens — and it 

 will be seen that, in the case of this pen 5, the colouring 

 does not extend above the base - line, which is numbered 

 100 in the column of figures given at each side of the 

 diagram. It will be further seen that the figures range up 

 to 300, and that, for example, in the case of pen 1 the black 

 colouring extends above the 300 line. That is to say, there 

 were more than 300 parts of nitrogenous substance con- 

 sumed in that pen, against only 100 in pen 5. In like 

 manner, the height of the colouring for each of the other 

 pens represents the proportion of nitrogenous substance 

 consumed in that pen compared with the amount in pen 5 

 taken as 100. 



Exactly the same plan is adopted in representing the 

 relative amounts of non- nitrogenous and of total organic 

 substance consumed in the different pens. Thus the lowest 

 amount of non-nitrogenous substance consumed per 100 lb. 

 live- weight per week was in pen 10, which is therefore iepre- 

 sented as 100, and the relative amounts consumed in the 

 other pens are represented by the different heights of the 

 yellow colouring above the 100 base-line. 



Again, of total organic substance consumed per 100 lb. live- 

 weight per week, the lowest amount was in pen 23, and the 

 greater amount so consumed in each of the other pens is re- 

 presented by the height above the base-line of the red colour- 

 ing in each case. 



It need only be added that precisely the same plan is fol- 

 lowed in the construction of Diagram II., which shows the 

 relative amounts of the substances consumed in the different 

 experiments to produce 100 lb. increase in live-weight. 

 Difference Eeferring to the results, and first to those represented in 

 framnUro- Diagram L, which shows the relative amounts consumed per 

 genous and 100 lb. live-weight per week, a glance brings strikingly to 

 ™I^?!^™ view the fact, that there was no uniformity whatever in the 



genous con- .' J . . 



stituents. amounts of nitrogenous substance so consumed in the thirty 

 different cases, representing as many different rations. In- 

 deed, it is seen that the amounts ranged in the proportion of 

 100 to more than 300 ; with very great variation between 

 these amounts. The range in the non-nitrogenous substance 

 so consumed is, on the other hand, very much less ; reaching 

 in but few cases from 100 to 150. Lastly, in the case of the 

 total organic substance the range is less still. 



