H. E. WuOD.MAN H).T 



course, be measured under the conditions of this experiment. Recourse 

 was therefore had to the correction figure given by Armsby^, namely, a 

 deduction of 60-1 Cals., was made per 100 gm. of digested carbohydrates. 

 In this way, the following figures were obtained, which are compared with 

 figures given in the second column, which have been calculated by the 

 use of Armsby'.s factor by multiplying the digestible organic matter by 

 1-588. 



Table XXIV. Corrected melaholisahle energies compared 

 with calculated values {per 100 lbs. dry fodder). 



Experimental C'alculiitcd 



figure figure 



therms tlierms 



Creeu uats ami tares 102-10 'Jobl 



( )at and tare liav 09-55 95-23 



Oat and tare silage 10.3-89 95-72 



The values obtained by the use of Armsby's factor are thus uniformly 

 lower than the experimental figures. 



The above results are in h-irmony with the conclusions drawn from 

 a study of the digestibihty and nutritive value of the fodders. As between 

 the hay and the silage, the advantage appears to rest with the silage. 

 In order to obtain the actual productive energy of the foodstufi's (Net 

 Energy Values), it would be necessary to make a further subtraction 

 corresponding with the energy used up in mastication and digestion and 

 ultimately lost as heat from the body (Increment of Heat Production). 

 It may be presumed that this consideration would operate still further 

 to the advantage of the silage, since it is reasonable to suppose that less 

 energy will be used up in the mastication and digestion of the soft and 

 succulent silage, than in the corresponding processes with the dry and 

 coarse hay fodder. 



In conclusion, the writer would Uke to take this opportunity of 

 acknowledging his indebtedness to Professor T. B. Wood, C.B.E., M.A., 

 F.R.S., for nnich valuable advice during the course of this investigation; 

 also to Mr Arthur Amos, M.A., who not only supervised the making of 

 the hay and the silage, but also supphed the writer with many interesting 

 and useful details concerning the growing of the crop and the quality of 

 the respective fodders. 



1 Nvlrttioii of Farm Ainnmls, p. 030. ' 



{Received February 20th, 1922.) 



