280 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
variations, showed that the percentage volume varied from 66 to 44, 
averaging 61* *8. To determine the probable number of corpuscles 
for each percentage volume, the red blood-corpuscles in each case 
were carefully counted by means of the Thoma-Zeiss Hemacytometer. 
Fig. 26. 
The average of all the counts was 5,088,442, so that 1 per cent, volume 
was the equivalent of 98,578 red blood-corpuscles. One percentage 
volume may therefore for convenience be considered as representing 
100,000 red corpuscles. 
From his various experiments the author deduces the opinion “ that 
the hasmatokrit gives as accurate, if not more accurate, results than the 
Thoma-Zeiss apparatus as ordinarily employed, requires less skill, calls 
for no eye-strain, and the volume of red blood- corpuscles and number 
per cubic millimetre, and volume of white corpuscles, may be determined 
within ten minutes.” 
Fig. 27. 
AiM|il)miiliipuii»i |niii iM|iiiivimiwMii^|iiii|iiiMuwi«n^ 
Wi 7 !^ rrr^r 6 r^iyiTTio f w r J 
A table is added showing the variation in the volume of the blood- 
cells in a variety of diseases. 
Bacteriological Examination of Air. 1 " — Mr. J. E. Siebel made a 
bacteriological examination of air by passing it at about 40° through a 
* Mittheil. d. Zyraotech. Inst, zu Chicago, ii. No. 9. See Centralbl. f. Bakteriol. 
u. Parasitenk., xiv. (1893) p. 140. 
