Dyspnoea Laryngea. Roaring. Hemiplegia Laryngea. 155 



to the nasal muscles or common to all on one side of the face. 

 This, however, is snufHing rather than laryngeal stridor. 



Roaring apparently from paralysis of the laryngeal muscles has 

 been seen frequently in animals fed on the seeds of leguminous 

 plants and specially of the Lathyrus Cicera {Lathyrus Sativus 

 StendeV). The whole family of the Leguminoscs is open to sus- 

 picion as occasionally containing a poisonous principle capable of 

 inducing paralysis in animals fed on them. The Lathyrus Sativus 

 induces paralysis in man and the domestic animals in some parts 

 of India (Sleeman, Irving). The common cultivated tare (Vicia 

 Sativa) is well known to induce general paralysis, commencing 

 with the hind extremities, when fed to horses at the period of 

 ripening in Great Britain. In France the chick vetch (I,athyrus 

 Cicera or Sativa) has been repeatedly noticed to lead to the de- 

 velopment of roaring apparently from paralysis of the laryngeal 

 muscles. Horses fed on 17 lbs. daily (straw and seeds) were at- 

 tacked with roaring in five days. They gained in flesh and vigor, 

 had a smooth shining coat and supple skin, and standing at rest 

 presented nothing amiss, but after ten minutes trot they were 

 seized with roaring and if not stopped they soon fell to the 

 ground, with symptoms of impending suffocation (Delafond). 

 Horses fed heavily on the winter vetch with cut hay and molasses 

 were attacked with roaring if gently exercised for one or two min- 

 utes. It came on suddenly and threatened instant suffocation. 

 One horse fell and lay half an hour in a frightful state of dyspnoea. 

 More commonly they recovered after a few minutes rest. In the 

 intervals no disturbance of breathing nor any change of appetite 

 attested the slightest deviation from health. Reynal, Cruzel, 

 Cafiin, Motte and Ayrault mention similar occurrences. 



The paralysis of chronic lead poisoning will also cause roaring. 



Occasional or intermittent roaring. Puzzling cases are met 

 with in which a horse will roar at one time and not at another. 

 In such cases the veterinary profession has incurred an amount of 

 odium which was by no means deserved. Two veterinarians, 

 equally respectable and talented, appearing in a Court of Justice 

 to swear to the same animal which they had examined on different 

 days, respectively pronounce it a roarer or a sound horse, as it 

 happened to be at the time of the respective examinations. Such 

 cases have been differently accounted for. 



