GENERAL MEETING. 9 
The spread of spotted-fever, typhus-fever, in jails, ships, &c., was 
referred to the inoculating instrument of ‘fleas, &c.—these insects 
usually prevailing among filthy people thickly crowded together. 
That malarial diseases were ever produced solely by the inhala- 
tion of supposed poisonous vapors was held to be untenable. Ex- 
perimenters, who had demonstrated the existence of specific poisons 
for special fevers, had equally proven that the mode by which such 
poisons, when obtained, could be introduced into the body for the 
artificial production of disease, was by inoculation through the skin, 
These experiments were imitations of insect inoculation. The pro- 
boscis of the mosquito was Nature’s inoculating needle. 
The modus operandi of the eucalyptus tree in preventing malarial 
diseases was ascribed tentatively to the tree being destruetive to, or 
interfering directly or indirectly with, the propagation and develop- 
ment of mosquitoes. 
From the foregoing conceptions as to the origin of malarial dis- 
ease, the following prophylactic measures were deducible: 
1st. Personal protection from all winged insects, especially during 
evening and night, by gauze curtains, veils, window-blinds, or 
clothing impenetrable by the proboscis of inoculating insects; and 
further, personal protection both from these and all creeping insects, 
especially during epidemics, endemics, and in crowded jails, ships, 
&c., by daily inunction of the whole body with some terebinthinate, 
camphorated, or eucalyptalized ointment or liniment. 
2d. Domiciliary protection (a) exteriorly, by screens of trees, walls, 
fences, &c., interposed at some distance between dwellings and the 
supposed sources of malaria, or mosquito nurseries ; and with fires 
or lamps arranged as traps for the attraction and destruction of 
such winged insects as may encroach nearer. A further protection 
(6) in the interior of dwellings being secured by the use of smoke 
(as of tobacco or prethrum) or of some volatile aromatic substance, 
as of camphor, assafcetida, garlic, &c., which may be offensive to 
proboscidian intruders. 
3. Municipal protection by groves of trees (pines, cedars, or eucal- 
yptus) planted between cities and the sources of malaria and mos- 
quitoes, together with cordons of electric or other lights, between 
said grove and the marsh, the lights to be arranged as fly-traps for 
the retention and destruction of such winged insects as may be thus 
secured. 
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