oio Voyage of the Novara. 



maro-in of the crater were accurately laid down by means 

 of the Theodolite, and the whole island submitted to a 

 geometric network of angles. At the same time the geologist, 

 with the aid of the compass and the patent levels, prepared 

 a chart originally intended for geological purposes only, while 

 the draughtsman of the expedition added to its value, by 

 skilfully sketching in from these given points the configuration 

 of the coast-line of the island. By their united efforts there 

 has been published a chart of St. Paul, which gives even 

 to the minutest details an entirely correct and accurate repre- 

 sentation of the form and surface of the island. This minute 

 chart, or plan, was prepared on a scale of 132 Vienna 

 fathoms to one Vienna inch, or -q^i^ of the natural size. 

 Moreover, it is intended preparing, from this map and from the 

 various outlines and views taken on the spot, a plastic model of 

 the island after Nature, which, moulded in gypsum, will give 

 scientific inquirers the most accurate conception of its singular 

 structure. Not less interesting for navigators in the Indian 

 Ocean will be the publication of the various observations 

 which, during our stay of 18 days, were made with the 

 barometer, thermometer, tide-gauge, and gauge of the velocity 

 of currents, taken at certain fixed hours^ day and night, 

 as also the soundings in the crater-basin, and on both sides of 

 the bar. Although the complete publication of these data 

 must await the appearance of the nautical portion of the 

 present work, we shall give here the most important of these 

 results. The extreme length of the island from N.W. 



