Very interesting indeed, although the dodgy English makes it a difficult read.

On this link... http://www.nsf.gov/pubs/1997/antpanel/3enviro.htm it is summarized that "Antarctica is composed of two major, geologically distinct parts bridged by a vast ice sheet." We only know this from infrared satellite imagery. How would Phillip Bousher know this circa 1737? That's exactly what we see on his ice free map.