608 
BURSATIE. 
nature, I shall say more hereafter. For comparison, I pro¬ 
pose to give a brief description of morbid developments, 
and for brevity sake shall define a tumour as a morbid pro¬ 
duct, possessing an inherent power of increasing in size, 
as the result, perhaps, of indirect or ill-directed growth-force, 
or perhaps originating from matter exuded from the blood, and 
due to some unknown cause. Such growths, as a rule, are 
unimpeded by any remedial means that have hitherto been 
devised. 
Pathologists divide morbid growths into three classes: 
1. Classification by structure. 
(a) Benign ; ( b ), malignant; (c) semi-malignant. 
Malignant growths are said to possess fifteen charac¬ 
teristics : 
- 1. Attended with pain. 
2. To progress constantly. 
3. Their progress to be generally rapid. 
4. To have a constitutional origin. 
5. To return, if cut out. 
6. To be attended with a cachexy. 
7. Liable to secondary deposits. 
8. Likely to become diffused over the body from increase 
of the materies morbi. 
9. Possess a tendency to soften inwardly. 
10. Are heterologous in structure. 
11. Resist all treatment. 
12. Invade the lymphatics. 
13. Ulcerate outwardly. 
14. To infiltrate tissues in their vicinity. 
15. To ultimately prove fatal. 
The only morbid growth possessing all these marks is 
cancer. 
Semi-malignant growths include those which are very 
much like cancer ; but do not possess all the characteristics 
of that fatal malady. All tumours are said to be of constitu¬ 
tional origin, and liable to return after extirpation, and to 
invade internal organs; some growths also show a tendency 
to return in situ after removal; and others to take on 
malignant action. 
Dermatologists speak of an order called Tubercula , which, 
as applied here, does not signify tuberculosis. I make this 
remark to prevent misconstruction by those who argue that 
bursatie is allied to tuberculosis. 
Tubercula may be defined as little globular tumours, firm or 
