Vol. 60, 1909 - University of North Carolina at Chapel Hill

394 THK CHARLOTTE MEDTCA T. JOURNA]
the teaching staff of a medical college, and book, say that bruises or contusions, par
thus are hampered by agreements or work ticularl\' those involving the bones, are not
preventing outside activity. The demand infrequently followed by malignant tumors, '
for medical graduates specially trained in and it is noteworthy that these tumors are ,
public health lines is soh growing that it most apt to be of the connective tissue type
tends to become a serious consideration be- —sarcoma, osteo-sarcoma, chondroma, &c.
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cause the supply is not ready to meet the Epithelial tumors, on the other hand, are
demand. The opportunity is here, yet is more frequently developed at the seat of renot
recognized by the recent graduate, who,
not realizing the overcrowding of all other
peated injury or long-continued irritation.
Thus, epitheliomata are common in the J
medical branches, seeks to emulate the bril- mouth, near a rough ulcerated tooth, on the ]
liant achievements of his teachers in the lips of pipe smokers, at the edges of chronic i
other departments. ulcers, on the skin of workers exposed to !
The duties of the various chemical or mechanical irritants; in \
sanitarian require
to be a sociologist, an economist,
him
a statis- cicatrices; at the orifices of the stomach and
tician, and a diagnostician, and that he at the anus. Finally, the frequent occurshall
have some knowledge of engineering, rence of carcinoma of the liver with cirrlaw,
chemistry, and entomology. The fore- hosis, though less easy of interpretation
most duty is educational, advisory. It is than many instances of the association of
mainly through public instruction and not tumors with chronic inflammation, is worthy
legal enforcement that the people will appredate
the value of prevention. Practical
of notice in this connection.
ever, be remembered that
It must, howunduesignifij
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demonstrations of the ravages of tubercu- cance should not be attached to the occa- <
losis and their preventi(jn have more influ- sional association of tumors with trauma, ;
ence than the simple trite statement that it prolonged irritation, and chronic inflamma- .
is cheaper to prevent tuberculosis than to tion, since in the great majority of cases (
care for its victims. The people must be these conditions are not follov/ed by tumors, |
shown that it is cheaper to furnish a town "or, furthermore, has it ever been possible ij
or a single house with pure water, unpol- to induce genuine tumors experimentally |
luted milk, or other foods than to pay for under these readily secured coudilions in n
an epidemic. Places maintaining danger- animals. The bearing of trauma upon the jj
ous conditions cannot afford to take the origin of tumors is to be held in mind in ji
risk. If resorts want the support of the estimating the influence of sex, since males
people and the profession, they must sup- are in general more liable to injuries than
ply conditions which are truly health-giv- females. The relatively common developing.
To exterminate mosquitoes not only ment of tumors in pigmented and other
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means the obliteration of a pest and a dis- naevi of the skin illustrates the significance P.
ease, but a marked increase in realty values, of local malformations as predisposing fac-
With most people the whole subject of pub- tors in the origin of tumors, although it
lie health is a matter of money expendi- should not be forgotten that many of the
ture, that plan which is the most economi- complex tissue growths often reckoned
cal being accepted." To the general towns- among tumors and called teratomata are
man what may seem a hardship must be really embryonic rudiments of another inshown
to be the better plan, as the closing dividual. While such rudimentary emof
every school to check an epidemic of bryos may be large and present such divermeasles.
These are but some of the duties sity and arrangement of tissue as to render)
of those who accept the opportunity to work the character of the growth obvious they
for the public health. may, on the other hand, be very simple in
character, as in bOGAU rftGToas
some of the so-called der-
IN BT10I.0GY OF
TUMORS. moid cysts. 1 hese are all to be regarded
. ., .• 1 . r , , rather as malformations than as genuine
Among the many et.olog.c factors which
^^^ g^^.^^^l ^,^3^^ 1^^^.^ been recorded
are looked upon asimportant.n considering „ ^^^.^^ j^,^^ .„^^. j^ i ,^^^^ has been a
the development of tumors, the idea, from •
'
i i j- i I c ^^ r j j
, . ,
• . •,,.,: mechanical displacement of cells heterotOr
which escape seems impossible that trauma
^,-^_f,„^ ,,hich in their new situation tu.
stands in positive causative relationship ni
^^^^ j^^^,^ developed. These cases, which
many instances has persistently imposed
^^^^ ^^^^ -^^ ^ ra^^^^x^ parallelled by ex-
Itself upon the minds of observers. Cer- - •
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. , ^ ^^i^ociviria. ^ci
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penments in animals, illustrate an importtaiiily
an iinposnig array of instances can » i c •» i ^ r. ,•
, ••: ^ , . ^.. .''^ ' =ia.i..ca^aii
ant class of congenital tumors, often cystic
be cited in wlucli tumors, and esoeciallv i . i • i < i <
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, , r^„ coucumuy jjj character, which arise from embrvonal
malignant tumors, follow local injuries
either mechanical or toxic, or are associated
with chronic inflammatory processes. Delacell
displacement, or, as is the case in many
„f ^^^ j^^^^, ^j tl,^ ^^.^^ at the side of
bronchial clefts, from an imperfect closure|
field and Prudden, in their excellent text of embryonal openings.
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