eee. 
L. W. MeCay—Massive Safforite. 369 
In view of these large possible errors, it is quite evident that 
the determinations of the digestibility of these three ingredients 
of the malt-sprouts and cotton-seed meal have little scien- 
tific value, This was, 0 i 
tegards the crude-fiber of the cotton-seed meal from the fact 
that an apparent negative digestibility was observed. Moreover, 
1t 1s evident that the fat determinations are equally valueless, 
since an apparent digestibility of more than 100 per cent was 
observed in every case. We must conclude, then, that while, 
’$ shown on p, 366, the digestibility of the total ration was 
determined with reasonable accuracy, the computation of the 
digestibility of the bye-fodder involves so many possibilities of 
*tror that the results have very little value. Essentially the 
ob conclusion was reached by Kiihn in his paper already 
If we concede this, however, the further question arises, 
whether the results of the large number of digestion experi- 
* 
tihn’s experiments and those here reported were made with 
a f 
Which we find given in tables of the digestibility of fodders, 
ve, of course, a certain practical value as approximations to 
the truth, They may properly be made the basis of the calcu- 
lation of rations in practice, but neither they nor the single 
S$ upon any given fodder can properly enter into any 
“entific calculation of the nutritive effect of a ration. 
SS 
Arr. XLVI.—WMassive Safflorite; by LuRoy W. McCay. 
ABour a year and a half ago I published, in Freiberg, 
Saxony, a pamphlet upon cobalt, nickel and iron pyrites. 
“Othe first part of this little brochure ? 
that the rhombic modification of speiskobalt, so carefully 
described by Sandberger and by him called spathiopyrite, 1s 
identical with the safilorite of Breithaupt. The arguments 
* Beitrag zur Kenntniss der Kobalt, Nickel- und Eisenkiese, Freiberg, 1883. 
