430 



INFECTIVE DISEASES. 



more or less parallel to the superficial muscular fibres. Complete 

 tranverse sections of the tongue, double-stained, readily show this 

 arrangement, even to the naked eye. Induration of the tongue 

 results from secondary interstitial glossitis. The author has seen, 

 in one case only, a tumour embedded in the substance of the tongue 

 about the size of a small Tangierine orange, and more or less isolated 

 from any surrounding growth. 



(d) The pharynx, where the disease may \ occur in the form of 

 polypoid growths producing asphyxia. 



FIG. 182. A NORFOLK STEER WITH EXTENSIVE ACTINOMYCOTIC ULCER ATION OF 



THE SKIN OF THE FLANK. 



(II.) In the Respiratory system we may meet with the disease in : 



(a) The nasal cavities, originating primarily there or resulting 

 from extension of a growth from the lips, or the pharynx. 



(6) The larynx and trachea, generally in the form of polypoid 

 growths, sessile or pedunculated, which arise primarily or occur 

 secondarily, by extension from the tissues in the neighbourhood. 



(c) The lungs, where the differentiation of the disease is most 

 important, as neoplasms in the lungs, especially in the early 

 stages, and nodular growths on the pleura, may be mistaken for 

 tuberculosis. 



The disease is very rarely found in connection with the 

 Nervous system (III.), but probably does not so rarely attack the 

 Reproductive system (IV.). 



