BULLETIN 568, U. S. DEPARTMENT OF AGRICULTURE. 
From two samples of sulphur several pieces of different appearance 
were picked out, ground, and analyzed for arsenic, with the results 
given in Table IV. 
Table IV. — Arsenic in different pieces of sulphur from the same field sample. 
No. 
Sub- 
sample. 
Appearance. 
Arsenic 
as As 2 3 
(parts per 
million). 
No. 
Sub- 
sample. 
Appearance. 
Arsenic 
as As.O; 
(parts per 
million). 
179 
1 
2 
3 
4 
1 
2 
10 
270 
160 
66 
35 
80 
188 s 
179 
179 
Slightly orange, porous.. 
More orange than sub- 
188 
188 
188 
188 
4 
5 
6 
crystalline 
Orange, vitreous 
160 
150 
Lemon yellow, crystal- 
line 
179 
188 
Average of the sample. . . 
Average color 
50 
450 
188 
do 
300 

After a small part of sample 179 had been removed in subsamples 
1,2, and 3, the remainder was ground and used as an average sample 
of 179 in the same way in which the other samples of sulphur were 
used. It is believed that the average value of 66 parts per million is 
not appreciably different from that which would be obtained for the 
arsenic in sample 179 if no subsamples had been removed. So many 
subsamples of sample 188 were taken that it was not possible to obtain 
an average value of this sample. 
The results of analyses of the subsamples of sample 179 indicate 
that with sulphur taken from a lot containing on the average 66 
parts of arsenic per million, one kiln of hops might be treated with 
fumes from sulphur containing 270 parts of arsenic per million, while 
the next treatment might be with sulphur containing only 10 parts 
of arsenic per million. 
Since only a small quantity of sulphur is burned at one time in 
curing hops, it is very probable that the sulphur used on a particular 
kiln of hops will not contain the same quantity of arsenic as an 
average sample of the sulphur on hand. 
The results for the subsamples of samp-e 188 show irregularity of 
distribution of arsenic much like that in sample 179. The relation 
between the arsenic in sulphur and in the hops for which the sul- 
phur is used can not be very definite. No uniform quantity of sul- 
phur is used for a given quantity of hops; the arsenic is not uni- 
formly distributed through the hops in the kiln at one time and the 
arsenic is not uniformly distributed through the sulphur. 
The analyses of samples 190, 220, and 227 show that smphur can 
be obtained which is practically free from arsenic. The analyses of 
samples of hops cured with sulphur containing very little arsenic 
indicate that hops may be cured with sulphur containing as much as 
10 parts of arsenic per million without becoming contaminated with 
more than 0.5 part of arsenic per million parts of hops. 
