The population of India is the largest aggregate yet brought within the scope of a synchronous and uniform enumeration.
Copper would thus have been but seldom used unalloyed; and the relatively synchronous appearance of bronze in Europe, and the scanty "finds" of copper implements, are explained.
The most important innovation, however, was the transfer of the responsibility for filling up the schedule from the overseers to the householders, thereby rendering possible a synchronous record.
De Mortillet to the second stage of his system of cave-chronology, and that synchronous with the third division of the Quaternary period.
The results of the Australian and German expeditions, which were for a great part of the time synchronous with those of Scott and Amundsen, required to be taken into consideration before a general theory of the atmospheric circulation within the Antarctic circle could be established.