154 The Ai^jplication of Photography, <&g. By Dr. Woodward. 
Table III. — Measurements of Red Corpuscles of the Guinea-pig from 
One Individual. 
1. Drop A, Neg. 852 
2. Drop A, „ 850 
3. Drop A, „ 851 
4. Drop A, „ 853 
No. of 
Cor- 
puscles 
measured. 
Diameters of Guinea-pig's Blood. 
Decimals of an English Inch. 
Decimals 
of a 
Millimeter. 
Maximum. 
Minimum. 
Mean. 
Mean. 
Ill 
100 
90 
100 
•000363 
•000372 
•000353 
•000382 
•000265 
•000265 
•000253 
•000265 
•000308 
•000310 
•000313 
•000314 
•007823 
•007874 
•007950 
•007975 
I propose to make a number of other negatives of the blood of 
the dog and the guinea-pig at an early day, with a view to addi- 
tional measurements ; but those now published are, I must think, 
quite sufficient to demonstrate the reckless temerity of those who 
would attempt to discriminate human blood, even on nicely dried 
slides prepared with every possible care to preserve the shape of the 
corpuscles. 
