W. F. Cooper and H. E. Laws 
211 
The Quantity of Arsenic retained by the Skin of the Oxen for Various 
Periods after Dipping. 
Period 
elapsing 
Nature of Integument 
Frequency 
since last 
No. 
Hair 
Hide 
of dipping 
dipping 
1 
Long, fine 
Very thin 
Every 5 days, 
1 day 
and thick 
then 6 spray¬ 
ings in 24 
hours 
2 
Strong, 
Medium 
Every 5 days, 
1 „ 
medium 
thick¬ 
then daily for 
length, 
not thick 
ness 
10 days 
3 
Fine, long 
Medium 
Every 5 days for 
1 „ 
and very 
thick¬ 
months; last 
thick 
ness 
sprayings 
every 3rd day 
4 
Strong, 
Very 
Every 5 days 
5 days 
medium 
thick 
for several 
length, 
months 
fairly 
thick 
Amount of arsenious 
Amount of arsenious oxide in entire skin 
oxide per square foot (based on average superficies 
of skin of beast of 50 sq. ft.) 
Hair Hide Total Hair Hide Total 
gm. gm. gm. gm. gm. gm. 
0-302 0-228 0-530 15-100 11-400 26-500 
0-201 0-196 0-397 10-050 9-800 19-850 
0-527 0-224 0-751 26-350 11-200 37-550 
0-352 0-251 0-603 17-600 12-550 30-150 
5 
Moderate- 
Faii-ly 
Dipped regular- 
10 „ 
0-260 
0-137 
0-397 
13-000 
6-850 
19-850 
Iv long 
thick 
ly for several 
months 
Mean 
0-328 
0-207 
0-535 
16-420 
10-360 
26-780 
6 
Fairly 
— 
1 spraying 5 
5 days 
0-116 
— 
— 
5-800 
— 
— 
long, fine, 
days before 
medium 
death, not 
thick- 
sprayed for 
ness 
previous 
eight weeks. 
Carcase sprayed 
Analysis 
0-470 
0-008 
0-478 
23-500 
0-040 
23-540 
immediately 
made as 
after death 
soon as 
skin was 
dry 
7 
Fairlv 
— 
— 
8 weeks 
0-159 
— 
— 
— 
— 
— 
long, 
medium 
thickness 
8 
— 
— 
— 
6 months 
0-388 ■ 
— 
— 
— 
— 
— 
9 
' — 
— 
— 
7 „ 
0-019 
— 
— 
— 
— 
— 
In such an investigation as this, it would be desirable to make a 
very large number of analyses before drawing conclusions from small 
variations in the figures, but the amount of labour and the cost of 
stock would be excessive. 
By taking the mean values of Watkins-Pitchford’s figures, however, 
the results should be sufficiently accurate for practical purposes, and 
