NUTTALl's DEATH CAMAS AS A POISONOUS PLANT 9 
given in a single feeding, so that it was possible to tell with consider- 
able exactness the time elapsing between the feeding and the appear- 
ance of symptoms. Table 2 shows this time in the case of the sheep. 
Table 2. — Time between feeding of -plant and development of symptoms in sheep 
Sheep No. 
Time elapsed 
before symptoms 
Sheep No. 
Time elapsed 
before symptoms 
741 
Hours 
1 
21 
26 
1 
5 
0 
5 
1 
Minutes 
20 
44 
54 
44 
5 
29 
0 
9 
726 — 
Hours 
4 
3 
2 
1 
25 
Minutes 
45 
22 
13 
56 
10 
746... 
755 
748 
759 
752 — 
721 -. 
715 
712 
727 
Average . 
720 
7 
45 
752. 
The longest period was in the case of sheep 748, 26 hours and 54 
minutes. The shortest time was in sheep 727, 29 minutes. 
COMPARISON OF SPECIES OF ZYGADENUS IN REGARD TO THE TIME 
BEFORE DEVELOPMENT OF SYMPTOMS 
In Bulletin 1240 is a table in which is compared the time of the 
development of symptoms in the species of Zygadenus which had 
been studied up to that time. For the purpose of comparison that 
table is reproduced here with the addition of the data in regard to 
Z. nuttallii, as Table 3. 
Table 3. — Minimum, maximum, and average time elapsing between the feeding of 
Zygadenus to sheep and development of symptoms 
Species of Zygadenus 
Minimum 
Maximum 
Average 
Z. paniculatus ..- 
55 minutes 
8 hours 40 minutes 
7 hours - 
3 hours 14 minutes. 
1 hour 53 minutes. 
2 hours 25 minutes. 
1 hour 22J4 minutes. 
7 hours 45 minutes. 
Z. elegans 
Immediately 
Z. venenosus 
44 minutes... 
9 hours 40 minutes 
7 hours 30 minutes 
26 hours 54 minutes . . . 
Z. gramineus 
5 minutes 
Z. nuttallii 
29 minutes 
It was noted in Bulletin 1240 that there was no material difference 
in the time of development of symptoms between the species Zyga- 
denus paniculatus, Z. elegans, Z. venenosus, and Z. gramineus. It 
may be a matter of some interest that, though the minimum time of 
development of symptoms in Z. nuttallii was practically the same as 
that in the other species, the maximum and average were considerably 
greater. Whether any special significance should be attached to 
this fact may be a matter of question, but it seems evident that the 
effects of this species do not appear so soon as do those produced by 
the species reported in the earlier bulletins. 
DURATION OF SICKNESS 
Table 4 shows the time during which the sickness continued. As 
this is estimated from the first noted symptom to the last, the time 
in most cases is probably somewhat less than that during which the 
