586 DISEASES OF THE MAMMARY GLANDS. 



the surrounding tissue. It is malignant in character, is often impossible 

 to completely remove, returns after extirpation, and infects neighbouring 

 lymphatic glands. 



Betueeu these two varieties may be placed a third, occujDying an 

 intermediate position as regards both its characteristics and gravity. 



Practically a knowledge of the above facts is a sufficient guide in 

 dealing with lesions of this character. 



Canalicular Papillomata. — There exists another variety of tumours 

 which is of much more frequent occurrence, and which is apt to cause 

 mistakes. This variety consists of inter-canalicular papillomata. 



These show no sign of their existence on external examination of 

 the diseased udder, and can be diagnosed only by reasoning based on 

 the signs observed. 



They are of very small size, and grow from the internal wall of 

 the galactophorous sinus or excretory canal. They increase in length, 

 finally extending for some distance along the sinus, where they remain 

 uni'ecognised until some external manifestation arouses suspicion as to 

 their existence. 



Ihider the mechanical contraction due to milking they easily become 

 excoriated, and their existence is then suggested almost solely by the 

 fact that the milk is tinted with blood, for palpation of the udder very 

 seldom gives more than negative results. 



The diagnosis is always doubtful. The prognosis is grave, because 

 it is impossible to remove the tumour, which is often deeply placed 

 ^Yithin the udder. There is no curative treatment. 



VERRUCOUS PAPILLOMATA OF THE UDDER, 



In cows suffering from cutaneous papillomata the udder is often 

 covered with a varying number of little sessile warts, which are spread 

 over a considerable surface, are very sensitive, and bleed at the lightest 

 touch. ]\[ilking is thus rendered extremely painful and difficult ; the 

 animals struggle, kick, and become dangerous. 



The condition is extremely troublesome, and in spite of every pre- 

 caution the milk is always soiled. 



The best method of treatment consists in removing the warts 

 individually \Yith fine, sharp-ljladed curved scissors. 



The animals must be firmly secured, if necessary cast, and the 

 operator should avoid removing more of the skin covering the udder 

 than is absolutely necessary. The bleeding which follows is trifling, 

 and stops of itself. After wasliing the parts with an antiseptic solu- 

 tion, the little wounds may be powered with a mixture in equal 

 proportions of tannin and boric acid. 



