On the Fluctuations in the Number of white Blood Corpuscles etc. 



63 



Heyerdahl \ are very striking. I have also taken note of this con- 

 dition by counting the leucocytes first in the sitting (s) and shortly 

 after in the recumbent position (r). At the same time I measured 

 the blood-pressure and the calibre of the arteries ^ 



The frequency of the pulse was likewise taken in both positions. 

 The measurements were made first in the sitting and then in the 

 recumbent position in the order given. 



1 1. с 



2 These were measured with Oliver's liæmadynamometer and arteriometer (the 

 instruments are described by Oliver in "Pulse Gauging". London 1895). The 

 first instrument after some experience gives the "diastolic blood-pressure" Avith 

 an exactness of ca. + 5 mm. ; the sjstolic is less certain, as this is only given 

 by the index standing still or remaining unchanged at a minimum. The pulse- 

 pressure can therefore also be given only by estimate. The arteriometer, which 

 is a much easier instrument to work with, has given me in a long series of 

 experiments a coefficient of variability of 2 — 4 "lo. 



3 7th drop. ^ 10th drop. 



