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



U-shaped instrument devised by Ostwald for the comparison of viscosities, 

 and was, in our case, about 20 cm. in length. 



A measured quantity of the blood, serum, or other fluid (about 2 c.c. with 

 the smaller tubes) was introduced by means of a calibrated pipette down the 

 wider arm into the larger bulb near the bend of the U. As will be seen 

 from the diagram (fig. 3), the other limb of the viscosimeter was made 

 of eapiUary tubing with a second and smaller bulb blown about 14 cm. above 

 the bottom bend. The capillary tube above this smaller bulb was generally of 

 wider bore and bent some four or five times away from the vertical, alter- 

 natively right and left as shown ; in order to still further reduce as much as 

 possible any irregularities or disturbances resulting from a too rapid sedimen- 

 tation of the corpuscles at the bend joining the two limbs of the viscosimeter, 

 the bend consisted of tubing of enlarged bore whilst the blood itself was well 

 mixed by previously bubbling a slow stream of air through it before 

 measuring the rate of flow. 



Thermometer 

 / Stirrer 



Fig. 2.— Diagram to show Arrangement Fig. 3.— Diagram of Viscosimeter and 



of Apparatus in Thermostat. Holder. 



