GihraUar. '^^ 



carry them through the Straits ; in the same way the westerly 

 horizon is sometimes crowded with ships, prevented by con- 

 trary winds from entering the Mediterranean. 



We found at the station an Aneroid-barometer, and a ther- 

 mometer. The advantages for navigation and physical science 

 of extensive meteorological observations, regularly made, are 

 so evident, that it is astonishing to see how often opportunities 

 are neglected for making them, such as are oifered here. 



There was no opportunity for seeing any of those fami- 

 lies of monkeys, the occasional appearance of which on the 

 Rock of Gibraltar has given rise to tales found in books of travel 

 of the existence of a submarine communication, through which 

 this single representative of the genus in Europe has found its 

 way to this rock from Africa. Sometimes, however, during east- 

 erly winds, single individuals are observed on the highest peaks 

 on the eastern side of the rock, where it is completely inaccess- 

 ible; probably the remnants of that ^^qg\q% (^Inuus ecaudatus)^ 

 which at some former time, either by chance, or human agency, 

 have found their way hither from the Moorish coast. 



The calcareous caves are very remarkable. That on the 

 western side, called St. Michael's, situated at a height of 

 800 feet, is the most important. It contains beautiful stalactite 

 formations, and seems to be of considerable extent ; it has, how- 

 ever, not been closely examined hitherto, as only a small part 

 is conveniently accessible. St. Martin's Cave, on the south- 

 east, likewise about 800 feet above the level of the sea, is 

 smaller, but its stalactites are of a purer whiteness. A third 



D 



