Research in human geography has as its object the study of man in his relations to the earth. Students of civilization, like Montesquieu and Buckle, sought to explain the culture and behavior of peoples as the direct result of the physical environment. Friedrich Ratzel with his "thorough training as a naturalist, broad reading, and travel" and above all, his comprehensive knowledge of ethnology, recognized the importance of direct effects, such as cultural isolation. Jean Brunhes, by the selection of small natural units, his so-called "islands," has made intensive studies of isolated groups in the oases of the deserts of the Sub and of the Mzab, and in the high mountains of the central Andes.
Biology indicates isolation as one of the factors in the origin of the species. Anthropology derives the great races of mankind—the Caucasian, the Ethiopian, the Malay, the Mongolian, and the Indian—from geographical separation following an assumed prehistoric dispersion. A German scholar, Dr. Georg Gerland, has prepared an atlas which plots differences in physical traits, such as skin color and hair texture, as indicating the geographical distribution of races.
2. Isolation and Social Groups
Anthropogeographical and biological investigations have proceeded upon the assumption, implicit or explicit, that the geographic environment, and the physical and mental traits of races and individuals, determine individual and collective behavior. What investigations in human geography and heredity actually demonstrate is that the geographic environment and the original nature of man condition the culture and conduct of groups and of persons. The explanations of isolation, so far as it affects social life, which have gained currency in the writings of anthropologists and geographers, are therefore too simple. Sociologists are able to take into account forms of isolation not considered by the students of the physical environment and of racial inheritance. Studies of folkways, mores, culture, nationality, the products of a historical or cultural process, disclose types of social contact which transcend the barriers of geographical or racial separation, and reveal social forms of isolation which prevent communication where there is close geographical contact or common racial bonds.
The literature upon isolated peoples ranges from investigations of arrest of cultural development as, for example, the natives of Australia, the Mountain Whites of the southern states, or the inhabitants of Pitcairn Island to studies of hermit nations, of caste systems as in India, or of outcast groups such as feeble-minded "tribes" or hamlets, fraternities of criminals, and the underworld of commercialized prostitution. Special research in dialects, in folklore, and in provincialism shows how spatial isolation fixes differences in speech, attitudes, folkways, and mores which, in turn, enforce isolation even when geographic separation has disappeared.
The most significant contribution to the study of isolation from the sociological standpoint has undoubtedly been made by Fishberg in a work entitled The Jews, a Study of Race and Environment. The author points out that the isolation of the Jew has been the result of neither physical environment nor of race, but of social barriers. "Judaism has been preserved throughout the long years of Israel's dispersion by two factors: its separative ritualism, which prevented close and intimate contact with non-Jews, and the iron laws of the Christian theocracies of Europe which encouraged and enforced 'isolation.'"[116]
3. Isolation and Personality
Philosophers, mystics, and religious enthusiasts have invariably stressed privacy for meditation, retirement for ecstatic communion with God, and withdrawal from the contamination of the world. In 1784-86 Zimmermann wrote an elaborate essay in which he dilates upon "the question whether it is easier to live virtuously in society or in solitude," considering in Part I "the influence of occasional retirement upon the mind and the heart" and in Part II "the pernicious influence of a total exclusion from society upon the mind and the heart."
Actual research upon the effect of isolation upon personal development has more of future promise than of present accomplishment. The literature upon cases of feral men is practically all of the anecdotal type with observations by persons untrained in the modern scientific method. One case, however, "the savage of Aveyron" was studied intensively by Itard, the French philosopher and otologist who cherished high hopes of his mental and social development. After five years spent in a patient and varied but futile attempt at education, he confessed his bitter disappointment. "Since my pains are lost and efforts fruitless, take yourself back to your forest and primitive tastes; or if your new wants make you dependent on society, suffer the penalty of being useless, and go to Bicêtre, there to die in wretchedness."
Only second in importance to the cases of feral men are the investigations which have been made of the results of solitary confinement. Morselli, in his well-known work on Suicide, presented statistics showing that self-destruction was many times as frequent among convicts under the system of absolute isolation as compared with that of association during imprisonment. Studies of Auburn prison in New York, of Mountjoy in England, and penal institutions on the continent show the effects of solitary incarceration in the increase of cases of suicides, insanity, invalidism, and death.