of Boston and its Vicinitif. 



139 



SPECIES 



IV 



V. 



VI. 



Ochrey brown oxide of Iron, — Colour and soil brownish 



orange ; smell, taste, and fracture earthy ; friable. 



J^odular Iron Stone, Streak grey, yellowish, or brown- 

 ish ; semihard or soft ; in rounded or oval masses. 



Carbonate of Iron, 



perfectly rhomboidal ; effervesdes feebly with nitric 

 acid. 



Structure foliated ; fragments im- 



t j JVot jnagnetick after roastin 



S 



I. 



GENUS IV. 



EartJiy oxide of Manganese, Fuses into a black slag ; 

 tinges borax purple. 



4 



\ 



% 



