- DISEASES OF THE BLOOD. 123 



a sulphur colour. The tubes are occupied by softened 

 scrofulous matter, intermingled with frothy mucus. Accu- 

 mulations of softened tubercle, surrounded by cretaceous 

 or caseous matter, are termed vomicas. The anterior 

 appendix of each lung is, perhaps, the earliest seat of 

 deposit. The pulmonary lymphatic glands at the roots 

 of the lungs are involved in the diseased action. The 

 serous membranes are very ^frequently the seat of scro- 

 fulous deposit. The pleura is especially liable to present 

 growths of this nature. Such may occur in phthisical 

 cases, or may exist independently of lung invasion. 

 Yery frequently they are found in fat cattle slaughtered 

 for food, animals in very fine condition which have not re- 

 cently exhibited the slightest appreciable sign of disorder. 

 In such cases we sometimes wonder how respiration can 

 have been sufficiently performed, to such an extent do these 

 " grapes " occupy the cavity of the thorax. The base of 

 the tumour formed by them may be attached to the dia- 

 phragm, or most frequently to the pleura costalis. Some- 

 times the mediastinum and the pericardium are the seat of 

 the deposit. Besides these large main masses, smaller tu- 

 mours occur in various parts of the membrane, consisting of 

 more recently formed material, the larger masses exhibiting 

 different stages of retrograde change in their various parts. 

 Tabes Mesenterica is that form of scrofula in which the 

 mesenteric glands are the seat of tubercle. Animals ema- 

 ciated as a result of tuberculosis, especially the form at 

 present under description, are vulgarly known as " piners.^' 

 The symptoms present are those of general ill health, and 

 rapidly increasing debility. There may be sympathetic 

 cough. Occasionally the animal manifests slight abdominal 

 pain ; diarrhoea is persistent. The appetite is good, and per- 

 haps inordinate. This state of affairs occurs most frequently 

 in young animals, and post-mortem examination, besides 

 the tumefied and tuberculosed condition of the mesenteric 

 glands, shows tumours on many parts of the peritoneum. 

 The mesentery and the omentum are extensively involved, 

 and the stomachs, liver, and intestines, are frequently 

 bound together by deposit. As a concomitant there may 



