. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. s aggravated as time passes. If after aday or two the animal is forced to rise and is driven a few yards, muscularspasm, especially in the limbs, is evident. The sheep then refuses tomove, stands with hind limbs placed well under the body and all feetspread apart laterally. The back is arched, the neck is stretched and thehead lowered (Fig. 42). Quivering then spreads from the limbs over theentire body becoming more intense until it becomes an in volitional tremor, io6 PASTORAL
. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. s aggravated as time passes. If after aday or two the animal is forced to rise and is driven a few yards, muscularspasm, especially in the limbs, is evident. The sheep then refuses tomove, stands with hind limbs placed well under the body and all feetspread apart laterally. The back is arched, the neck is stretched and thehead lowered (Fig. 42). Quivering then spreads from the limbs over theentire body becoming more intense until it becomes an in volitional tremor, io6 PASTORAL AND AGRICULTURAL BOTANY followed by slight, intermittent tetanic contractions. At this stage oftrembling, ataxia is pronounced and the animal is unable to stand. Itdrops to the ground with its head and neck outstretched and jaw close tothe ground (Fig. 43). Trembling is repeated every time the animal ismade to rise. The animal becomes comatose after the second or third(lay and may lie prostrate on its side until death occurs. The symptomsof tremblers in hogs are in general like those in sheep (Figs. 44 and 45).. Fig. 41.—Ewe 161 in a characteristic posture when the tremors following the eat-ing of white snakeroot {Eupatorium urticafolium) have become acute. The animalhas spread its feet apart to remain standing. {After Wolf, F. A., Curtis, R. S. andKaupp, B. F.: A Monograph on Trembles or Milk Sickness and White Bulletin 15, North Carolina Agricultural Experiment Station, July, 1918, Plate2, Fig. B.) The onset of milk sickness in man is gradual, and after a day or two ofweakness and debility accompanied by loss of appetite, the patient isseized with epigastric distress. Violent vomiting follows, associated withobstinate constipation with great thirst. Abdominal pain is noteworthyand muscular tremors are generally present. The foul odor of the breathis characteristic. The tongue is swollen. Respiration is normal, but thetemperatures is subnormal (97° to 9
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