THE RELATIONS OF METABOLISM TO FOOD-SUPPLY. IU1t 
Meat Eaten ein (+) or Loss (—) of Fat. 
Deis of Expectant par Urs According to Pet-| According to 
tenkofer & Voit. liger. 
Grms. Grms. 
Feb. 19, 1861 see ys Seed dS 1800 + 1.4 —35.8 
Apr 850 ewes cana ve . 2500 +56.7 + 3.93 
ch. 4, 1862 d digscoarpete Grabeel 1500 + 3.4 —29,.3 
21, lo Dre serenes 1500 + 7.3 —23.4 
Apr. 7, Tenens 1500 +34.4 + 3.7 
pV Reamer area rere merce 1500 +20.7 —11.1 
cage © Vane ee ees Be OS 1500 +35.9 + 3.8 
O16, OY aw aeses amy nee 1500 +22.9 — 8.4 
Aug. 6). 8 sei caeescdece exe 1500 + 8.7 —13.5 
fs Rec beg aha el gCSEES 1500 +17.4 — 8.3 
1500 0.0 —31.6 
1500 + 9.9 —22.1 
1500 + 2.1 —24.4 
1500 +14.3 —16.9 
1500 0.0 —31.8 
1500 +13.8 —17.5 
1500 + 9.0 —22.0 
1500 +12.7 —13.0 
1B. 1500 +26.3 — 6.4 
5 1500 +29.1 — 2.9 
OD a tecalt ater eos Gio 2000 +55.9 +13.6 
EEE DG ee ciatecaheands gsenee 2000 +58.5 + 1.6 
July By egies aie: Sained 1500 +11.9 —20.6 
ae | re er ee ee 1500 * + 9.4 —23.7 
and since Pfltiger’s estimates seem to be at least as trustworthy as 
Pettenkofer & Voit’s, and lead to exactly the opposite results, the 
only verdict possible, so far as these experiments are concerned, is 
“Not proven.” 
Later Exprriments.—Shortly after the publication of Pfliger’s. 
critique, E. Voit,t in a preliminary communication, presented the 
results of investigations upon this question undertaken in the 
Munich laboratory. So far as the writer is aware, no complete 
account of these experiments has yet appeared, but the data given 
by Voit in the preliminary account show a retention in the body 
of 8 to 10 per cent. of the carbon of the metabolized proteids, and 
to this extent confirm the earlier results obtained by his father. 
He believes the observed gain of carbon to be too great to be 
accounted for by the storage of glycogen and interprets it as 
showing a production of fat from proteids. 
*Includes a correction of Pettenkofer & Voit’s figures for the urinary 
nitrogen. Loc. cit. p. 263. 
+ Thier. Chem. Ber., 22, 34. 
