chap, xiv.] NATURAL HISTORY. 317 



while the main portion of the island consists of old sedi- 

 mentary rocks. Neither of these physical differences cor- 

 responds with the remarkable change in natural produc- 

 tions which occurs at the Straits of Lombock, separating 

 the island of that name from Bali ; and which is at once 

 so large in amount and of so fundamental a character, as 

 to form an important feature in the zoological geography 

 of our globe. 



The Dutch naturalist Zollinger, who resided a long time 

 in the island of Bali, informs us that its productions com- 

 pletely assimilate with those of .Java, and that he is not 

 aware of a single animal found in it which does not in- 

 habit the larger island. During the few days which I 

 stayed on the north coast of Bali on my way to Lombock, 

 I saw several birds highly characteristic of Javan orni- 

 thology. Among these were the yellow-headed weaver 

 (Ploceus hypoxantha), the black grasshopper thrush 

 (Copsychus amcenus), the rosy barbet (Megalaema rosea), 

 the Malay oriole (Oriolus horsfieldi), the Java ground 

 starling (Sturnopastor jalla), and the Javanese three-toed 

 woodpecker (Chrysonotus tiga). On crossing over to 

 Lombock, separated from Bali by a strait less than twenty 

 miles wide, I naturally expected to meet with some of 

 these birds again ; but during a stay there of three months 

 I never saw one of them, but found a totally different set 

 of species, most of which were utterly unknown not only in 



