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exhalations from disturbed virgin soil arising after exposure to sun and rain. In 1848, the Colonial Surgeon traced it to the prevalence of electricity in the atmosphere. But during the next few years fever put in a sudden and equally malignant appearance in places where the soil had not been disturbed and at times when electricity in the atmosphere was particularly scarce. At a former period Hongkong fever attacked Indian troops when it spared European troops. During the administration of Sir G. Bonham fever raged epidemically in the garrison, both European and Indian, while it left the civilian population untouched. Thus it was particularly in July and. August, 1848, when, after several months of excessive heat, fever decimated the garrison to an alarming degree. The same epidemic recurred among the garrison in July and August, 1850, when no excessive heat but an unusually prolonged winter season had preceded it. In the short interval of six weeks, the 59th Regiment was more than decimated, 43 men having died (though many more were stricken with fever) between 14th July and 23rd August, 1850, whilst the health of the civilians in Hongkong continued generally good. It is noteworthy also that, after that unusually prolonged winter of 1840 to 1850, an epidemic, having all the appearances of the plague (black death) which devastated London in 1665, broke out in Canton in May, 1850, but, though it raged there for several months, it did not spread to Hongkong. In autumn (1850), when the fever had ceased ravaging the garrison of Hongkong, it broke out among the Chinese population. It was then ascribed to long continued drought. From 1850 to 1853 the average annual death rate among the civilian European population was 8 per cent. and among the Chinese 3 per cent., while among the troops it varied considerably. In 1850 the death rate among European troops was 23 per cent, and among the Indian troops 10 per cent. The case was reversed in 1852, when the death rate of European troops was 3.6 per cent, and that of the Indian troops 10.02 per cent. In 1851 and 1853 the death rate was the same among both classes of troops. But whilst in all the preceding years fever appeared principally in