180 



V. E. HENDERSON. 



high values found. In none of these cases, however, could the osmotic 

 value of the proteid present have been greatly reduced. By bleeding 

 and replacing the blood with isotonic saline it readily could be. The 

 following experiment is typical. 



EXP. IX. Dog 9 kg. Usual connections made. Between each alteration in circulatory 

 conditions, i.e. before bleeding or injecting saline, etc., the ureter manometer connections 

 were opened. Tabular protocol in brief. See also Fig. 5. 



Flow from other P.c. of P.c. of 



kidney in drops haemo- total 



Diff. per min. globin* solids 



62 app. 0-8 



58 app. 2-0 



59 4 



100 



100 



37 



27 

 21 



37 



18 



17 

 11 



10 



17 



12 



16 



5 



20 



13 

 11 



16 



89 



51 



47 

 45 

 38 



22 



14 



76 



39 



28 



26 



23 



19 



* Haemoglobin percentage was obtained by a tintometer, the first sample serving as 

 normal (100 / ). Total solids were obtained by drying and are given as percentage of first 

 sample as 100. Results as indicating the proteids are naturally too high in final stages 

 by the latter method. 



As may be seen, the flow here was quite rapid when there was a 

 minimum difference of but 10 mm. Hg. In no case was a lower differ- 

 ence obtained. In exp. V. abundant secretion occurred with a blood- 

 pressure of but 32 mm. Hg; the percentage of haemoglobin was less than 



