Text book of veterinary medicine, Volume 3 (of 5)Law, James
Science
Text book of veterinary medicine, Volume 3 (of 5)
Law, James
Veterinary medicine
=Narcotics.= Next must be noted those alimentary matters which are
hurtful by reason of narcotic constituents. At the head of this list may
be placed the lolium temulentum or intoxicating ryegrass. like the vicia
sativa or cicera, the seeds of this are always poisonous, hence its
significant name. Then the other ryegrasses, perennial and annual
(Italian), though perfectly safe in ordinary circumstances, develop at
the period of ripening a narcotic principle, which produces cerebral
congestion or inflammation in whole stables of horses at a time. The
lolium temulentum is poisonous to man and animals alike. Baillet and
Filhol obtained from the seeds an etherial extract containing a bland
oil to the amount of two fifths and a yellow extract to the extent of
three-fifths. The amount of this extract derived from three ounces of
the seeds often developed the most violent symptoms in the dog, while
that furnished by six pounds of the seeds proved fatal to the horse.
Pigs and cattle seemed to be unaffected by the agent when given by the
mouth. Sheep suffered more but required large doses. Ducks and chickens
were practically immune, being affected only by very large doses.
Rabbits were not poisoned by the yellow etherial extract, but succumbed
to a watery extract. Brydon found that lambs suffered extensively from
eating the heads of the ryegrass.
Lupins on certain lands produces an icteric disorder accompanied by
cerebral symptoms but the result is not the same under all conditions
and it has been suspected that the symptoms were caused by cryptogams
and their products. The same remark applies to the brain symptoms
sometimes produced by trefoil, equisetum and other plants.
A great number of =narcotic= and =narcotico-acrid= plants produce
nervous symptoms indicating cerebral congestion or inflammation such as
ranunculus, wild poppy, digitalis, fennel, œnanthe crocata, hellebore,
veratrum, conium, yew, tobacco, box, aconite, cicuta virosa, even
buckwheat at the time of flowering, vetch and flax.
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