New Fuhlications. 433 



with a coloured geological map and numerous sections. By- 

 Mr David Landale, Coal-Engineer, Wemyss, Fifesliire. 



(3.) On the Geology of Morayshire : with a coloured geolo- 

 gical map. By Mr John Martin, Elgin. 



(4.) Outlines of the Geology of Fen/rewshire and the North 

 of Ayrshire : with a coloured geological map. By William 

 Montgomery, Esq. younger of Cloak. 



(5.) Outline of the Geology of the South-east District of Perth- 

 shire : with a coloured geological map, and coloured sections. 

 By George Buist, Esq. Cupar of Fife. 



(6.) Geognostical Account of the County of Sutherland: 

 with a large coloured geognostical map and many sections. By 

 Robert James Hay Cunninghaai, Esq. Member of the Wer- 

 nerian Society, &c. 



4. Researches on the Development, Structure, and Diseases of the Teeth. 

 By Alexander Nasmytw, F.L.S., F.G.S, Member of the Royal College 

 of Surgeons, London. 8vo, pp. 182, with seven highly finished plates. 

 J. Churchill, Soho, London. 



Odontology, or the anatomical, physiological, and patholo- 

 gical history of teeth, has, till within a comparatively late pe- 

 riod, been almost entirely in the hands of the mere dentist. 

 The early and beautiful observations of Leeuwenhoek, publish- 

 ed in the Philosophical Transactions for the year 1678, which 

 may be considered as having paved the way for the interest- 

 ing researches of modern investigators, were forgotten or al- 

 most entirely neglected, until the subject was taken up by 

 two able naturalists Retzius, a Swede, and Purkinje, a Ger- 

 man, who, unknown to each other, resumed the coui'se of in- 

 vestigation began by Leeuwenhoek, by a series of observations 

 upon the structure of the teeth, with the assistance of the 

 microscope. MUller of Berlin, our celebrated comparative 

 anatomist Owen, and an acute and accurate observer, Mr 

 John Goodsir jun. of Anstruther, by pursuing the same path, 

 have still farther extended our acquaintance with the struc- 

 ture and physiology of the teeth. 



Mr Alexander Nasmyth (brother of the well known and ac- 

 complished Edinburgli odont(jlogist), the author of the very va- 

 luable volume now before us, has also contributed many new 



