Thomas S. Hart was a teacher at the Ballarat School of Mines, and a member of the Ballarat Field Naturalists ClubArticle with illustrations published by the Royal Society of Victoria by Thomas S. Hart. The following plates are included: Fig 1. The Main Divide and some of the transverse ridges Fig 2. Hills on and near the Divide at the Ercildoun and Ascot Gaps Fig. 3. Profile of the Divide at Ascot Gap. Fig. 4. Sketch of the Hills west and north-west from Mt Buninyong - - The divide in Ascot Gap from Mt Blowhard (Serra Range, Mt William, Mt Ararat, Larne Gerin, Ben Major, Mt Cole, Mt Misery, Mt Bolton) Fig. 5. Diagram to illustrate the possible courses of the leads south of the present Divide - Burrumbeet Basin (Smythesdale, Ballarat, Lal Lal , Mt Doran, egerton, Parwan Creet, Rowsley Fault, Eastern Plateau) Fig. 6. Diagramatic cross section of the grampians, south of Hall's Gap. Profile of the Pyranees, from maiden Hill - Diagramatic Section of the Grampians south of Hall's Gap. (Mt Cole, Mt Mitchell, Ben Major, Ben More, Avoca Hill, Hall's Gap.) Fig. 7. Profile of the Pyrenees as seen from Maiden Hill near Waubra.thomas hart, thomas s. hart, ballarat school of mines, ballarat field naturalists club, royal society of victoria, western victoria, ballarat, great dividing range, mt william, volcano, volcanic plains, waterways, lal lal basin, yarrowee creek, ballarat common, lava flow, wendouree, warrenheip, ballarat plateau, mt elephant, grampians, t.s. hart, mt buangor, mt beckworth, mt misery, mt bolton, lal lal iron ored, mt ararat, mt wiliam, mt cole, burrumbeet, mt warrenheip, daylesford, waubra, ercildoun gap, smythesdale, lal lal falls, parwan valley, burrumbeet creek, staffordshire reef, pyranees, bacchus marsh, rowsley fault, ben nevis, avoca hill, landsborough hill, mt blowhard, weatherboard, mclean's hill, fyan's creek, thomas stephen hart, lal lal