i>lf> Scientific Thtelliencc.^-'Geography. 



three of the most intelligent of the other Indians to follow up 

 liis search in the ensuing year ; and he feels persuaded that the 

 pursuit will be ultimately attended with complete success.' "" — 

 Ledger. 



25. Mr Thomas Parle's Journey into tlie Interior of Africa. 

 — Our young friend, and former pupil, Mr Park, son of the 

 celebrated traveller Mungo Park, by this time far in the inte- 

 rior of Africa, writes to us as follows. — " Accra, illth September 

 1827. — I intend to set off to-morrow morning. I have been 

 nearly three months here, during which time I have been prin- 

 cipally busy with the study of the Ashantee language. Some 

 time ago I made an excursion of about fifty miles into the inte- 

 rior by way of experiment, and did not fail to look around me, 

 and notice the rocks and other natural productions. I have only 

 time to say, that the valley of Accra is about twelve miles in 

 breadth, and fifty in length ; the bottom is covered with a soft 

 sandstone, and this sandstone in one place was observed resting 

 upon clay-slate. The mountains bounding the sides of this long 

 valley, as far as I could observe^ appear composed of quartz- 

 rock and clay-slate alternating with each other, and disposed in 

 strata ranging SSW. and NNE., the dip from 30° to 80° (the 

 direction of the dip not given). The quartz-rock contains grains 

 of gold, as I ascertained by careful examination. In some blocks 

 of rock (vsyenite) I noticed a good many crystals of sphene, and 

 in one place I saw what I imagined to be black manganese ore. 

 It is very hard and heavy, and is fashioned by the Ashantees 

 into balls. The cover of alluvium, in the bottom of the valley, 

 and extending down to the sea-coast, is of such a nature as to 

 lead me to conjecture that it is of marine origin, and, therefore, 

 that the sea formerly extended a long way inland. The bases 

 of the hills are richly clothed with trees ; but these diminish in 

 number towards the coast, where there occur only a bush here 

 and there.'" 



ARTS. 



26. Manufacture of Ultramarine. — M. Gay Lussac announced 

 to the Academy, that M. Tunel, inspector of gunpowder and 

 saltpetre, had succeeded in the direct formation of ultramarine, 



