The Prince George's enquirer and southern Maryland advertiser. (Upper Marlborough, Md.) 1882-1925, 1900-06-08
MOSQUITOES AND MALARIA.
DR.. THAYER DESCRIBES THE SPECIES
THAT is DANGEROUS.

The third annual meeting of the
Maryland Public Health Association,
closed with an address on "Malaria
and Its Prevention" by DR.. W. S.
Thayer, Of the Johns Hopkins Uni
vcrsity. The association was in ses-
sion two days at the hall Of Medical
and Chirurgical Faculty of Maryland,
s47 North Eutaw street, Baltimore.
DR.. Thayer's address was to demon
state the important part played by
certain species Of mosquitoes in the
transmission of malaria. Some years
ago he lecturcd at Easton, Nd, before
the association Oh malaria and it's
cause, and his address recently was
sequel to that paper. In his audience
were number Of the leading physi-
clans of Baltimore and number of
ladies.
"It has been about 20 years." began
Dr. Thayer, "since the parasite of ma
laria was discovered and about Is
years since it has been recognized. 1t
lives in the blood and develops in the
red corpuscles, destroying them. They
are of different shapes in the course Of
their development and when fully de-
veloped are as large as the corpuscles.
When developed they rupture the cor
puscle and some of the parasites spor-
ulate, the spor attacking other corpus
cles. There are three species of the
parasite-one which develops in 4S
hours, another in y hours, and the
third varies in development from "a to
over 4S hours. Often they exist in
enormous groups. The chill Of mala-
ria corresponds with the sporulating
of the parasites.
"When there are many groups OF
parasites they speculate daily, and we
have the continuous or remittent fe-
vers Some of the parasites do not
undergo speculation, but from them
wormlike forms issue. These forms
have been shown to be male and fe-
male. From their conjuga:ion comes
an shaped parasite, an extreme
ly active body, capable Of living out
side in other bodies. 1t has been de-
monstrated that these parasites can be
| removed from the blood of malarial
patient by mosquitoes and live in the
muscles of the mosquito.
at was formerly thought that there
were three ways for malaria to enter
the human system-by drinking water,
by respiration and by the mosquito
bite. For the first two no confirmato-
~ evidence has been produced. There
is no case on record where malaria re-
suited from drinking water. One in
vestigator drank the blood of mala-
ria patient with no ill effect. If it had
been administered hypodermically it
would have caused the disease.
at is hard to prove or disproye the
breathing theory. In 1888 DR.. King,
of Washington, suggested the mos
quito theory. All conditions for ac-
quiring malaria are favorable to mos
quitoes Where there are no mosqui-
toes malaria is almost unknown. That
mosquitoes can transmit malaria has
been proven on birds. The parasite is
transmitted through the salivary
glands. The parasite in a birds blood
and in a human beings blood is
nearly the same.
The common house mosquito OF
Baltimore, known rs the culex, is
not dangerous. The parasite is car
ried by the brindle or spotted winged
mosquito. known as the anopheles.
This mosunito has four spots Oh each
of his wings.
"The anopholes is easily distinguish
able from the culex. 1t is to be found
along the shores outside of Baltimore,
at Sparrows Point and in every sec
ton where malaria abounds. The Gu
lex has six legs, his hind legs be-
inc raised when standing on wall be-
hind his back, and one proboscis. The
anophoIes also has six legs, but
his hind legs generally reach to the
object he is resting on, and he seems to
have three proboscides.
a mosquito net is preventive
against malaria fever in such fever
districts 1t is 4 matter of record that
investigators have slept in the open
air in malaria countries under mos
quito nets and have suffered from no
ill effect from exposure. High winds
and high attitudes are unfavorable to
the anopholes, which freqent the low,
wurm and moist marshes and make
their attack i'll the still Of the eve
ming"
Young Jackson-Mr. johnson, your
daughter has promised to marry me.
Old Johuson-O Lawd! OATS wot
comes OBJ refusing to buy her a pug
doc '"'d get even wifi me