PHYSICAL GEOGRAPHY.—Even more helpful is Physical Geography, which surveys the earth in its three great divisions,—land, sea, and air,—without reference to lines of political demarkation. The configuration of the different portions of the globe, with the varieties of climate, the relations of mountain and plain, of land and water, have strongly affected the character of nations and the currents of history. In regions extremely hot or extremely cold man can not thrive, or build up a rich and enduring civilization. The occupations of a people are largely dependent on its situation,—whether it be maritime or away from the sea,—and on peculiarities of soil and temperature. The character of the Nile valley, and its periodical inundation, is a striking illustration of the possible extent of geographical influences. The peninsular and mountainous character of Greece went far to shape the form of Greek political society. The high plateau which forms the greater portion of Spain, with the fertile belts of valley on the Atlantic and Mediterranean border, have helped to determine the employments and the character of the Spanish people. Had the physical characteristics of the Spanish peninsula been essentially different, the success of Wellington in expelling the French, with the forces at his disposal, would not have been possible. Were there a chain of mountains along our Atlantic coast as near as are the Andes to the Pacific, what different results would have arisen from the English settlements in North America! The Alpine barrier in the north of Italy was indispensable to the building-up and maintenance of the dominion of ancient Rome. Of the great basin or plain between the Alps and the Apennines, open to the sea only on the east, through which flows one great river, fed by streams from the mountains on either side, Dr. Arnold says: "Who can wonder that this large and richly watered plain should be filled with flourishing cities, or that it should have been contended for so often by successful invaders?" While the agency of climate, soil, and other physical circumstances may easily be exaggerated, that agency must be duly considered in accounting for historical phenomena.
The best historical Atlas is the copious German work of VON SPRUNER. FREEMAN'S Historical Geography of Europe is a work of great value. DROVSEN'S Allg. Hist. Atlas. Smaller atlases are those of PUTZGER, Rhode, Appleton's Hist. Atlas, the International, and the Collegiate. Smaller still, Keith Johnston's Crown Atlases and Half-Crown Atlases. On Mediæval History, Labberton's Atlas; also, Koeppen: in Ancient Geography, SMITH'S work, KIEPERT'S, Long's. On Physical Geography, GUYOT'S text-books; Vaughan's Connection between History and Physical Geography, in Contemp. Review, vol. v.; Hall's Methods of Studying History, etc., p. 201 seq., Encycl. Brit., Art. Geography.
CHRONOLOGY.—An exact method of establishing dates was slowly reached. The invention of eras was indispensable to this end. The earliest definite time for the dating of events was established at Babylon,—the era of Nabonassar, 747 B.C. The Greeks, from about 300 B.C., dated events from the first recorded victory at the Olympic games, 776 B.C. These games occurred every fourth year. Each Olympiad was thus a period of four years. The Romans, though not until some centuries after the founding of Rome, dated from that event; i.e., from 753 B.C. The Mohammedan era begins at the Hegira, or flight of Mohammed from Mecca, 622 A.D. The method of dating from the birth of Jesus was introduced by Dionysius Exiguus, a Roman abbot, about the middle of the sixth century. This epoch was placed by him about four years too late. This requires us to fix the date of the birth of Christ at 4 B.C.
The day was the simplest and earliest division of time. The week has been in use for this purpose in the East from time immemorial. It was not introduced among the Romans until after the spread of Christianity in the Empire. The month was the earlier unit for periods of greater length. To make the lunar and the solar years correspond, and to determine the exact length of the solar year, was a work of difficulty, and was only gradually effected. Julius Cæsar reformed the calendar in 46 B.C., the date of the Julian era. This made the year eleven minutes too long. Pope Gregory XIII. corrected the reckoning, in 1582, by ordering Oct. 5th to be called the 15th, and instituted the "Gregorian calendar." The change, or the "New Style," was subsequently adopted by Great Britain (in 1752), and by the other Protestant nations. The difference for the present century between the Old and the New Style is twelve days: during the last century it was eleven. The Julian civil year began with Jan. 1. It was not until the eighteenth century that this became the uniform date for the commencement of the legal year among the Latin Christian nations.
On the general subjects of chronology: Encycl. Britt.,
Arts. Chronology and Calendar. Manuals of Reference:
ROSSE'S Index of Dates (1858); Haydn's Dictionary of
Dates (Vincent's edition, 1866); BLAIR'S Chronological
Tables; Woodward and Cates, Encycl. of Chronology (1872).
ETHNOLOGY.
Ethnology is a new science. Its function is to ascertain the origin and filiation, the customs and institutions, of the various nations and tribes which make up, or have made up in the past, the human race. In tracing their relationship to one another, or their genealogy, the sources of information are mainly three,—physical characteristics, language, and written memorials of every sort.
Ethnology is a branch of Anthropology, as this is a subdivision of
Zoölogy, and this, again, of Biology. Ethnography differs from
Ethnology in dealing more with details of description, and less with
rational exposition.
RACES OF MANKIND.—Authorities differ widely from one another in their classification of races. Prichard made seven, which were reduced by Cuvier to three; viz., Caucasian, Mongolian, Ethiopic. Blumenbach made five, and Pickering eleven. It is the Caucasian variety which has been chiefly distinguished in history, and active in the building-up of civilization. None of the numerous schemes of division, from a zoölogical point of view, however, are satisfactory.
Huxley has proposed a fourfold classification: 1. The Australoid, represented by the Australians and the indigenous tribes of Southern India. 2. The Negroid. 3. The Mongoloid. 4. The Xanthochroi, or fair whites, among whom are comprised most of the inhabitants of Northern Europe. To these are added a fifth variety, the Melanochroi, to which belong a part of the Celts, the Spaniards, Greeks, Arabs, etc.