1906.] The Viscosity of the Blood. 341 



(C) Anticoagulator — 5 c.c. of - 5 per cent, sodium citrate per 100 c.c. 



No. of red corpuscles 

 per cub. millim. ... 

 Specific gravity 







1 -042 



2 -7 x 10 6 

 1 -047 



5 -4 x 10 6 

 1 -055 



10 -8 x 10 6 

 1 -072 



Temperature. 



V- 



E. 



V- 



E. 



V- 



E. 



V- 



E. 



°c. 



32 2 

 35 -0 

 40-4 

 45 -0 



-0143 

 0135 

 -0123 

 -0111 



1-9 

 1-8 

 1-7 

 1 -5 



-0254 

 0234 

 0-0196 

 -0158 



3-5 

 3-2 

 2-7 

 2-1 



-0375 

 -0350 

 -0306 

 -0268 



5-1 

 4-8 

 4-2 

 3-7 



-1225 

 -1090 

 -0880 

 -0690 



16-9 

 14 -8 

 12 -1 

 9-5 



Mean temp, coeff. ... 



-00024 





-00075 





-00083 





-00417 





However, these specific gravity values are not of great importance, since 

 the degree of accuracy obtainable with a Thoma-Zeiss or any form of 

 haemocytometer limits the degree of accuracy of the other measurements. 



The Effect of Varying the Number of Corpuscles. — A most casual glance 

 at either of these tables or at Table III will at once show that the increase 

 of corpuscles always caused a marked increase in the values of rj, and may 

 under some circumstances result in a disproportionately large increase, 

 the values in Table I ranging from about 15 times that of water at 35° C. 

 to as much as 8 - 7 times (Sub-section A), or in Table III to lo - 6 times the 

 value for water (Sub-section A). 



This result is, however, most simply brought out by the curves in fig. 5, 

 in which are plotted a few values obtained at 35° C. (taken from Table I), 

 with the number of corpuscles as ordinates and the value for 77 as abscissae. 



E 

 £ 



la 8-io 6 

 o 

 i_ 



CO 

 Q_ 



<n 

 St 



% 4-IO* 

 3 

 Q. 



s_ 

 o 

 u 



% 



I o 

 E 



Z -Oi -02 -03 -04 ^05 ^06 



ViscosiCy Coefficients 

 Fig. 5. — Curves showing Effect of Corpuscles on Viscosity with different amounts of 

 Potassium Oxalate present. Temp. = 35° C. (Of. Table I.) 



