552 

 Bot 11 these substances were tlierelbre dissolved in the perfusion liquid. 



Experiment 10 (Sept. 20). 



The perfusion liquid contains 0,1"/,, ghicose and 0,050/n laevulose. 



Reduction 0,1 c.c. of solution passed 0,205" o- 



0,1 c.c urine of right kidney: 0,58 c.c. Iodine solution; reduction 0,1175%. 



0,1 c.c. urine of left kidney: 0,60 c.c. Iodine solution: reduction 0,127o' 



Retained by right kidney: 0,205-0,1175 = 0,0875«'o. 



Retained by left kidney: 0,205-0,12 = 0,0857o. 



Experiment 11 (Sept. 20). 

 The same perfusion liquid as in experiment 9. 

 Reduction 0,1 c.c. urine of right kidney 0,1550'„. 

 Reduction 0.1 c.c. urine of left kidney 0,15757o- 

 Retained by right kidney: 0,205-0,155 = 0,05%. 

 Retained by left kidney: 0,205-0.1575=0,0475%. 



Experiment 12 (Sepl. 20). 



The perfusion liquid contains a mixture of glucose and laevulose. 



Reduction of solution passed 0,205'yo. 



Reduction 0,1 c.c. urine of right kidney O.IIö'Vq. 



Reduction 0,1 c.c. urine of left kidney 0,127o- 



Retained by right kidney: 0,205-0,115 = 0,09" q- 



Retained by left kidney: 0,205-0,12 = 0,085"',,. 



Experiment 13 (Sept. 21). 



The perfusion liquid contains 0,07'V„ glucose and 0,05"/,| laevulose. 



Reduction 0,1 c.c. of tliis solution 0,1 75*^/ o (average of 3 homonymous experiments). 



0,1 c.c. urine of right kidney: 0,6;> cc Iodine solution; reduction 0,1275%. 



0,1 cc. urine of right kidney: 0,<i2 cc iodine solution; reduction 0,125" o- 



0,1 c.c. urine of left kidney: 0,65 cc. Iodine solution; reduction 0,1325%. 



Retained by right kidney: 0,175-0,1275= 0.0475%. 



Retained by right kidney :0,1 75 -0,125 ^ 0,05%. 



Retained by left kidney: 0,175—0,1825 = 0,0425%. 



Experiment 14 (Sept. 21) 



The same perfusion liquid as in experiment 13. 



0,1 c.c. urine of right kidney: 0,64 cc. Iodine solution; reduction 0,18%,. 



0,1 c.c. urine of left kidney: 0,64 c c Iodine solution; reduction 0,1275"/,). 



Retained by right kidney: 0,175— 0,13 = 0,045" ',j. 



Retained by leil kidney: 0,175—0,1275 = 0,0475"/,,- 



It ip apparent from these experiments that the gloniernlus epithelinni 

 which, as we have seen, is completely ()ermeable to laevnlose, has 

 held back a quantitj of glucose, which was also retained when the 

 solution perfused contained glucose alone. The laevulose while passing 

 itself does not oi- hardly influence the retention of glucose. With a 

 little exaggeration one might this say that th'. kidney separates the 

 glucose from the laevulose by means of /iltration. 



