=Diagnosis.= When the symptoms are fully developed the diagnosis of gangrenous coryza is extremely simple, but the absence of some of these may justify hesitation in forming an opinion. If the examination is carefully carried out, it is always possible to distinguish this disease from simple coryza, which is only accompanied by trifling fever, and in which appetite is preserved; from foot-and-mouth disease, with its very characteristic buccal eruption and absence of lesions from the upper portions of the respiratory tract; and from contagious ophthalmia. =Prognosis.= Up to the present time the prognosis has always been regarded as extremely grave, the mortality being sometimes as high as from 90 to 100 per cent., and moreover the cases which recover are invariably those of what is considered the chronic form. Sudden sinking of temperature during the disease is an unfavourable sign. From 1894 to 1900 Moussu never cured a single case, whatever his method of treatment; nevertheless, it now seems possible to regard the condition a little more hopefully, provided that no incurable complication occurs before the beginning of treatment. =Treatment.= Of all the modes of treatment suggested—viz., anti-febrile agents, general stimulants, purgatives, diuretics, external stimulant applications, etc.—none have succeeded. Antiseptics injected into the nasal cavities, antiseptics given internally, milk diet, and all the methods hitherto suggested are equally useless. The only treatment which appears to have achieved any degree of success is that of injecting physiological salt solution in large doses (up to six quarts per day, divided into three parts). All the animals treated by this method recovered, provided they presented no broncho-pulmonary complications. The sole inconvenience of this treatment is the difficulty in carrying it out when the animals are at a distance from the practitioner. It is indispensable that they should be close at hand, in order that he himself may make the injections at the proper time. There is some reason for hoping, however, that serum from animals which have recovered will prove to be more active than saline injections. This method of treatment should be followed up by the most rigid hygienic precautions. The mouth, nasal cavities and eyes should frequently be washed with antiseptic solutions. The stables should be freely ventilated, and the floors and bed kept in the cleanest possible condition, etc. Whenever a case of gangrenous coryza is observed it should be isolated, and the stables should most carefully be disinfected. TUMOURS OF THE NASAL CAVITIES. Apart from actinomycosis of the upper jaw, tumours of the nasal cavities or of the sinuses are not frequent in bovine animals. They are, however, occasionally met with, and present symptoms which must be carefully studied in order to avoid errors of diagnosis. Usually they are of the nature of myxomata, more rarely of fibro-myxomata.