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THE POPULAR SCIENCE MONTHLY. 



rivers. This kind of map was mainly used for military puri^oses, and 

 was regarded as a map of tlie world, for the vast extent of the Roman 

 Empire comprised nearly all that was then known of the hahitahle 

 world. 



FtG. 5.— Claudius Ptolemt. (Pioni an Old Map.) 



Great progress was effected in map-making by Marinus of Tyre, who 

 lived during the second century of our era. He studied with great 



