THE UTILIZATION OF ENERGY. 467 
the relative amount of excess food, to which may be added Kor- 
nauth & Arche’s results similarly computed: 
Excess Over : 
Fasting Percentage 
Metabolism, Utilization. 
Per Cent. 
Meissl : 
Experiment I......... 133 80.7 
ee AV 7 siete, bosseeans 250 75.2 
J ALL 2 eecas ones 74 70.9 
es AV cera wea 180 67.1 
Kornauth & Arche: ; 
Experiment III......... 126 71.7 
ie b Dh Senora 129 65.3 
While there is some variation in the percentage utilization, as 
would naturally be expected in experiments with different animals, 
the range in the relative amount of excess food is much greater 
and there is no indication of a connection between the two. 
Ruminants.—The earlier Méckern experiments by G. Kihn 
include one upon wheat gluten and two upon starch in which two 
different quantities were added to the basal ration of the same 
animal. The final results were as follows: 
Percentage 
Added Tate att 
Animal. Period. Basal Raion, yee 
able Energy. 
Til 3 0.68 45.3 
Wheat gluten.... { hi 4 1.36 48.0 
Vv 2a 2.0 53.2 
Vv 2b 2.0 53.7 
Starch........... Vv 3 3.5 59.7 
VI 2b 2.0 48.1 
VI 3 3.5 46.6 
These results do not indicate that any material effect is exerted 
upon the utilization of the metabolizable energy of the food by 
the amount consumed, since the differences are small in themselves 
and in both directions. 
The results, reported by Pfeiffer, of experiments upon the addi- 
tion of varying amounts of proteids to a basal ration, as computed 
by the writer (p. 465), likewise show a fairly constant percentage 
