The morning news. [volume] (Savannah, Ga.) 1887-1900, 1899-08-20

the incubation and survive to serve the
purposes of the doctors for further ex-
perlmentatons. The remaining mosquitoes
are killed off without conjunction or
protest from antivivisectionists Some ex-
permenters have had their birds sue
cumo 10 the severity of the disease thus
introduced into their systems
Facts From DIR. Thayer's Paper.
Investigation of the Transmission of ma
lara by mosquitoes was suggested by the
following facts as set forth by Dr.. William
). Thayer of Baltimore. in a paper on
malaria read before the Maryland Public
Health Association.
'MosquistOes invariably exist in malarI-
Gus regions, and the malarial fevers are
more prevalent at those periods when the
mosquitoes are most abundant; they are
especially numerous in the regions about
swamps and marshes where the dangers
of infection are greatest. In a malarious
district there is greater danger OF infec>
ton at about shutdown and at night but
sunset and night are periods at which
mosquitoes are highly active The dam
gers of infection are greater near the
ground than In elevated positions buzz
mosquitoes are more numerous near the
ground. The danger of infection is great
er on quiet nights than in windy weather,
but wind is particularly unfavorable TO
the mosquito.
''EmIn Pasha was so convinced that the
bite of the mosquito played an import
ant part in the etiology of malarial fever
in Africa that he always travelled with
mosquito net, and escaped the disease.
Bignami, further, has noted that in GER
tan parts of Italy workmen who live In
conical huts, with a hole at the top,
through which the smoke of their little
fire passes, are unusually free from the
disease, while those about them may be
almost universally affected. OF course,
the presence of smoke is one of the surest
projections against mosquitoes.
Koch, who last year devoted some
months in Africa to the study of malaria,
was strongly impressed with the probable
ity of the hypothesis. He says: The
more I study this disease che more I in
cline toward the opinion that the latter
| Circumference of the infection by means of
the mosquito is the main, probably the
only method. Wherever one goes he finds
tropical malaria and the mosquito pres
ent together On the coast Gn East AZ
| rica) there are several places which are
| free from the disease. One of these -
| the Island Chole, which lies upon the
| southern extremity of the Island of Ma
| fla. This is the only place on the coast
where 1 could sleep without a mosquito
| net. In the mountains malaria are to
be found. Inland malaria diminishes to-
| gether with the mosquitoes At those
| times of the year when there are many
| mosquitoes malaria is more severe.
THE natives of Usambara mountain Of
| ten acquire the disease when they descend
| to the lowlands. They believe it to be due
| to the bites of the mosquitoes, and call
| the disease by the same name which they
! give TO the mosquito Nbu.
Transmission of Malaria.
Fortunately it is believed that malaria
is the only disease transmitted by live
mosquitoes. Fnaria sanguinis hominis, a
| hmorrhagic disease, is communicated by
| dead mosquitoes that impregnate water
| with the germs, which are fatal to them
selves. Apparently the mosquitoes are no,
affected by the malaria gems which they
| breed.
Study of the carrying of malarial in
lection by mosquitoes has led to the con-
clusion that in this way alone is malaria
| communicated to human beings. 1t is
| said that demonstrations have proved con-
clusively that malaria cannot be acquired
| by drinking impure water or by inhala-
ton. Only one way remains then, it Is
| said, for the germ to get beneath the skin
of a human being and that is by an in
| sect's bite AS the mosquito is the most
common insect in malarious regions, at its
door is laid the charge of injecting human
| beings by its bite.