The dissemination of plant parasites is favored by many circumstances not always obvious, whence an air of mystery regarding epidemics was easily created in earlier times.
Endemic diseases are unknown and epidemics are rare.
The origin of these two epidemics was obscure.
The Malays formerly suffered severely from smallpox epidemics, but in the portion of the peninsula under British rule vaccination has been introduced, and the ravages of the disease no longer assume serious dimensions.
The epidemic nature of wheat-rust was known to Aristotle about 350 B.C., and the Greeks and Romans knew these epidemics well, their philosophers having shrewd speculations as to causes, while the people held characteristic superstitions regarding them, which found vent in the dedication of special festivals and deities to the pests.
It is among the Invertebrata that epidemics of destruction are referred to, though we should bear in mind that it is only the difference in numerical proportion that prevents our speaking of an epidemic of elephants or of rabbits, though we use the term when speaking of blight insects; there is little consistency in the matter, as it is usual to speak of an invasion or scourge of locusts, caterpillars, &c. Insect injuries are very varied in degree and in kind.
Experience with epidemics, dearly bought in the past, has shown that one fruitful cause is the laying open to the inroads of some Fungus or insect, hitherto leading a quiet endemic life in the fields and forests, large tracts of its special food, along which it may range rampant without check to its dispersal, nutrition and reproduction.
It may be that in particular cases particular modes of cultivation disfavour the host; or that the soil, climate or seasons do so; but overwhelming evidence exists to show that the principal causes of epidemics reside in circumstances which favor the spread, nutrition and reproduction of the pest, and the lesson to be learnt is, that precautions against the establishment of such favoring conditions must be sought.
Nevertheless, epidemics occur, and practical measures are devised to meet the various cases and to check the ravages already begun.
- Among the most Interesting modern means of waging war against epidemic pests is that of introducing other epidemics among the pests themselvese.g.
There have been several professional photographers (all detected in fraud sooner or later) who made it their business to take photo complaints, to certain epidemics of the middles ages,' and to phenomena that have occurred at some religious revivals.
Yellow fever epidemics are common on the Campeche coast, and sometimes appear at Progreso and Merida.
Epidemics of smallpox and typhoid occur; and leprosy, imported from the Orange River and Cape Colonies, has taken firm hold on the Basuto, of whom about 9r per too() are sufferers from this disease.
Aside from the recurrent loss of life, the pecuniary loss from such epidemics was enormous, and the interference with commerce and social intercourse with other countries extremely vexatious.
As a consequence of these insanitary conditions the death-rate is very high, and in case of epidemics the mortality is enormous.
The most valuable intellectual possession was a large mass of recorded observations in individual cases and epidemics of disease.
At the same time the discovery of new diseases, unknown to the ancients, and the keener attention which the great epidemics of plague caused to be paid to those already known, led to more minute study of the natural history of disease.
The name of John Pringle (1707-1782) should also be mentioned as one of the first to study epidemics of fevers occurring in prisons and camps.
Epidemics rarely spread over any considerable tract of country, but are nearly always confined within local limits.
Of these Adams accepts as certainly genuine the 2nd, 6th, 5th, 3rd (7 books), 4th, 7th, 8th, 9th and 12th, and as " pretty confidently acknowledged as genuine, although the evidence in their favour is not so strong," the 1st, Loth and 13th, and, in addition, (14) On Ulcers (IIEpi EXKc v); (15) On Fistulae (IIEpi vu piyywv); (16) On Hemorrhoids (IIEpi aipoppot&e); (17) On the Sacred Disease (IIEpi iepi l s yob o- According to the sceptical and somewhat subjective criticism of Ermerins, the whole collection is to be regarded as spurious except Epidemics, books i.
Daremberg's edition of the Ouvres choisies (2nd ed., Paris, 1855) includes the Oath, the Law, the Prorrhetics, book i., the Prognostics, On Airs, Waters, and Places, Epidemics, books i.
Above high water mark, and was thus for a long period subject to inundation and epidemics, and only careful drainage rendered the site healthy.
Mangrove swamps surround the town and epidemics of cholera, yellow fever and other tropical diseases have been frequent; but the unhealthiness of the climate is mitigated to some extent by the high tides which cover the marshes, and the invigorating breezes which blow in from the sea.
The city is built in a bowllike depression of the great central plateau, and the drainage from the surrounding hillsides has produced a dangerously insanitary condition, from which one or two virulent fever epidemics have resulted.
Some, however, give rise to dangerous or fatal diseases, while others may cause ravaging epidemics; instances of these are given under the various orders.
The climate is mild and healthy, although serious epidemics of yellow fever and typhus have occurred.
All collections of living beings are subject to epidemics, and in an ideal menagerie special precautions should be taken.
On both coasts yellow fever epidemics appear at frequent intervals.
There were no unusual epidemics during those years, and the rate given may be considered normal.
Epidemics of typhus are not unknown, as well as ophthalmia.
Drains were rare, epidemics common.
The virulence of infective diseases varies in different epidemics, and at different times in the same epidemic. It had been noted that many infective diseases did not attack an individual a second time, the first attack appearing to protect from subsequent ones.
Difficulties on the route; dissensions between Emin and the authorities in German East Africa, and misunderstandings on the part of both; epidemics of disease in Emin's force, followed by a growing spirit of mutiny among his native followers; an illness of a painful nature which attacked him - all these gradually undermined Emin's courage, and his diaries at the close of 1891 reflect a gloomy and almost hopeless spirit.
Medical men have stated that the number of deaths, in times when there are no epidemics, amounts to 59 or 20 per thousand, and the number of births to 25 to 40 per thousand.
During the epidemics of 1878 and 1879 fully two-thirds of the population fled from the city, many of whom died of the fever at other places, and a still larger number did not return.
For the epidemics of the succeeding centuries we must refer to more detailed works.(1)
It is impossible, however, to pass over the great cycle of epidemics in the 14th century known as the Black Death.
Moreover, as this complication was a marked feature in certain epidemics of plague in India, the hypothesis has been framed by Hirsch that a special variety of plague, pestis indica, still found in India, is that which overran the world in the 14th century.
(1) See Noah Webster's History of Epidemic Diseases, 8vo (2 vols., London, 1800) (a work which makes no pretension to medical learning, but exhibits the history of epidemics in connexion with physical disasters - as earthquakes, famines, &c.); Lersch, Kleine Pest-Chronik (8vo, 1880) (a convenient short compendium, but not always accurate); "Athanasii Kircheri Chronologia Pestium" (to A.D.
The most complete medical history of epidemics is Haser's Geschichte der epidemischen Krankheiten (3rd ed., Jena, 1882), forming the third volume of his History of Medicine.
(2) See the original account reprinted with other documents in Haser, op. cit.; also Hecker, Epidemics of the Middle Ages, trans.
Plague epidemics, even in the latest, that in Russia in 1878-1879, and, moreover, according to the latest accounts, are not a special feature of Indian plague.