338 Dr. A. du Pre Denning and Mr. J. H. Watson. [May 7, 



of this value of 77 for blood to that of water at 35° C. (viz., 0-007361 C.G.S. 

 units). 



The values given for the specific gravity are those used in making the 

 necessary calculations of 77 by means of Formula II. Most of these values 

 were obtained experimentally : from the data thus supplied the others have 

 been obtained by interpolation on the assumption based on Hayem's statement 

 that the specific gravity depends on the corpuscular richness of the blood, 

 although it may be remembered that Schmaltz, judging from observations with 

 his capillary pycnometer, concludes that the percentage of haemoglobin, and 

 not the number of corpuscles, is the main determining factor. 



Table I. — Showing the Effect on the Viscosity Coefficient of varying 

 (a) the number of red corpuscles, (b) the amount of salt added. 



Viscosimeter bore = - 6 mm. in diameter. 



(A) Anticoagulator — 5 c.c. of 01 per cent, potassium oxalate per 100 c.c. 



No. of red corpuscles 

 per cub. miilim. ... 







1 -030 



1 -6 x 10 6 

 1 -034 



4 -0 x 10" 

 1 -042 



8 4 x 10 6 

 1 -055 



Temperature. 





E. 



"J- 



E. 



'I- 



E. 



n- 



E. 



f °C. 



31 -8 

 35 -0 

 40-0 

 44-8 



-0144 

 -0137 

 -0120 

 -0108 



2-0 

 1 -9 

 1-6 

 1-5 



-0200 

 -0186 

 -0165 

 -0153 



2-7 

 2-5 

 2-3 

 2-1 



-0274 

 0-0258 

 0234 

 -0214 



3-7 



3-5 

 3 2 

 2-9 



-0637 

 -0554 

 -0456 

 -0376 



8-7 

 7 -5 

 6-2 

 5-1 



Mean temp, coeff . . . . 



-00028 





-00036 





-00046 





-00201 





(B) Anticoagulator — 5 c.c. of 0-2 per cent, potassium oxalate per 100 c.c. 



No. of red corpuscles 

 per cub. miilim. ... 







1-030 



1 -5 x 10 6 

 1 -033 



4 -2 x 10 6 

 1 -043 



6 -2 x 10 6 

 1 -050 



Temperature. 



V- 



E. 



n- 



E. 





E. 



V- 



E. 



C. 

 31 -8 

 35 -0 

 40-0 

 44-8 



-0137 

 -0128 

 0-0118 

 0-0106 



1-9 

 1-7 

 1-6 

 1 -4 



0-0176 

 -0160 

 -0139 

 -0128 



2-4 

 2-2 

 1-9 

 1-7 



-0254 

 -0231 

 -0205 

 -0182 



3-5 

 3 -2 

 2-8 

 2 5 



-0280 

 -0259 

 -0229 

 -0209 



3-8 

 3-5 

 3-1 

 2-8 



Mean temp, coeff. . . . 



-00024 





-00037 





-00055 





-00055 





