The Americans have made remarkable progress, assisted by their wonderful labour-saving appliances, chief among which are the 100-ton shovels, the Lidgerwood car-unloaders, and the track-shifters.
But chiefly, of course, by their sanitary methods, the protection afforded the employees against mosquitoes, and the abolition of mosquito conditions.

The natives and negroes are immune to yellow fever, but not to malaria.

As most of us know, Major Ross of the I.M.S., in 1896, proved the connection of malaria with the anopheles mosquito; and in 1902 Mr Reed of the U.S.Health Commission tracked the yellow fever to the stegomyia mosquito.

Yellow fever requires six days to develop.

It should be noted that the stegomyia insect is common in India, but luckily has not yet been infected with the germ of yellow fever.