12 BULLETIN" 942, U. S. DEPARTMENT OF AGRICULTURE. 
TIME EEQUI'BED TO PKODUCE SYMPTOMS. 
The following table shows the time that elapsed between the giv- 
ing of the plant and the appearance of symptoms : 
Table 6. — Time elapsed after feeding A. verticillata var. geyeri before appear- 
ance of symptoms. 
Animal. 
Quantity 
fed per 
100 
pounds 
of ani- 
mal. 
Result. 
Time elapsed 
before 
symptoms 
appeared. 
Sheep 473 
Sheep 482 
Sheep 523 
Pounds. 
2.205 
1.286 
1.47 
Very sick 
Sick 
....do.... 
Hrs. Mins 
14 10 
15 35 
20 35 
The average time before symptoms appeared was 16 hours 47 
minutes. As noted on page 6, this time, in the case of Asclepias 
pumila, was 16 hours and 17 minutes. In Bulletin 800, United States 
Department of Agriculture, page 34, it was shown that in the Ascle- 
pias galioides cases the average elapsed time was 14.1 hours. It is 
evident that in respect to the time elapsing between the feeding and 
the development of symptoms, the three species are practically alike. 
CONTINUATION OF SYMPTOMS. 
As in A. pumila cases, the symptoms persisted for a considerable 
length of time after their first appearance. 
In Sheep 473, symptoms continued 4 clays. 
In Sheep 482, symptoms continued 2 days. 
In Sheep 523, symptoms continued 1 day. 
Sheep 473 was the only animal seriously affected, and the symptoms 
continued much longer than in the others. 
COMPARISON OF DURATION OF SYMPTOMS IN A. PUMILA, A. VERTICILLATA YAR. GEYERI, 
AND A. GALIOIDES. 
The following statement shows the time during which symptoms 
persisted in the A. galioides cases : 
Horse 126, symptoms continued 6 days. 
Cattle 750, symptoms continued 1£ days. 
Sheep 478, symptoms continued 6 hours. 
Sheep 506, symptoms continued 3 hours. 
Sheep 534, symptoms continued 1 hour. 
- Sheep 542, symptoms continued 4 hours. 
Sheep 372, symptoms continued 11 hours. 
Sheep 522, symptoms continued (September 11) 3£ hours. 
Sheep 522, symptoms continued (September 22) 4 hours. 
For comparative purposes the horse and cow may be disregarded. 
In fact, the horse never completely recovered, although the immediate 
symptoms of the sickness disappeared. 
