354 
0.075 °/,; in the + experiments the urine showed the same reduction. 
In accordance with the hypothesis also of the d-mannose not a 
trace was retained. *) 
We did not have at our disposal the other abovementioned sugars 
except, however, the d-glukosamine 
C—OH 
H—d_NH, 
OH-—C-H 
H—C_OH 
H—C_OH 
CH,OH 
The 0.1 °/, solution of glukosamine as well as that of 0.08 °/, 
passed completely through the glomerular membrane. 
After this some pentoses were examined. Our hypothesis demanded 
that the following series should be retained: 
(1) l-arabinose (2) l-xylose (3) d-ribose 
C—OH C—OH C—OH 
H—¢_OH H_—C_OH H_—C_OH 
oH_¢_H OH_C_H H—¢_OH 
OH_C_H H—C_OH H_—C_OH 
CH,OH CH,OH CH,OH 
Concerning the l-arabinose, a solution of 0:07 °/, was perfused ; 
it had a reduction of 0.0714°/, glucose, which was also the case 
with the artificial urine; in contradiction to the bypothesis, there- 
fore, nothing was retained. 
In the case of l-xylose there was a retention, but this amounted 
only to more or less */, part, while not more than */, of the ribose 
was retained. 
To this partial retention of l-xylose and d-ribose we shall return 
in the next article. 
Lastly there follows here a series of pentoses, which, according 
to the hypothesis, were expected to pass through completely, 
1) Compare HAMBURGER and Brinkman, These Proc. Meeting of 28th Sept. 1918, 
Vol. XXI, NO. 4, 
