The round hair-worm (_strongylus filaria_) has been found in great numbers in the trachea and bronchii of calves by Camper, and of the sheep by Daubeuton. It has also been found in the reed and duodenum of the latter animal by Rudolphi. Two other species of the genus _Strongle_, the _S. contortus_ and _S. filicollis_, have been detected in the sheep, the former in the belly, the latter in the small intestines. They all appear to originate only in such sheep as are exposed to the sapping influence of low damp situations, combined with stinted diet. Those occuring in the air tubes give rise to irritation, and a consequent harassing cough, which is only to be arrested by removing the sheep to a dry airy locality, and a nutritious pasture. Unless portions of the worms are thrown up during coughing, they cannot be pronounced with confidence to exist, as the symptoms which they produce are very similar to those which accompany the two following diseases. (157.) _Coryza._ During the winter months, this affection is of very frequent occurence among sheep; but health is only in a few instances seriously affected. It is brought on by the exposure of the animal to intense cold, or to sudden chills, after it has been heated. In slight cases, the only annoyance to which the sheep is subjected, is from matter accumulating in the nostril, and plugging up the orifice, so that the poor creature is compelled to raise its head every three or four minutes, and labour hard for breath.[31] When the inflammation extends further down the air tubes, the symptoms assume a severer type, and death soon occurs, in general from suffocation. If the inflammation of the bronchial tubes becomes chronic, that is to say, if it goes on in a mild form for a length of time, pulmonary consumption (rot) will in all probability succeed, and destroy the sheep in a more lingering manner. [31] The sheep is more inconvenienced by Coryza than other animals, owing to the naturally small calibre of the nostrils, the inferior turbinated bone being of large dimensions, and occupying the greater part of the nasal cavity. It is from this peculiar formation of the nose, that sheep are so very easily blown, when made to exert themselves in running. (158.) _Treatment of Coryza._ Should this disease prevail in a lenient form among your sheep, removal to a sheltered field, and a dose of purgative medicine, are all that is required. If, however, the feverish symptoms are severe, besides giving a purgative, bleed at the outset of the disease, and administer ten grains of the following fever powder, dissolved in a tea-cupful of warm water:-- Take of powdered Digitalis (Foxglove) half a drachm. Tartarized Antimony fifteen grains Nitre two drachms.