450 PROFESSOR HEDDLE ON 
of the sand; the stream enters the sea at the south end of the east sands 
of St. Andrews. It runs past a trap “agglomerate.” The iserine is in highly 
brilliant but minute bluish-black grains, which are strongly magnetic. 
1 gramme yielded— 
iigdiedcid: » .« ow . ShinQope 
29 
Ferric Oxide, : ; : ’ ; 22° 867 
Ferrous Oxide, . é ; : é 30°98 
Manganous Oxide, dh 
Lime, . 5*936 
Magnesia, : ; ; : al) 
Silica, . : F : ‘ 4 t Seal! 
100° 363 
Under the microscope this showed as a fine-grained sand, the cleavages of 
which were not flat. Only one crystal was seen ; it had one face truncated, and 
it seemed to be a rhombohedron. 
6. Found in 1848, on the shore at Granton, Edinburghshire. It was about 
the spot where the west breakwater now leaves the shore. It occurred mixed, 
but not largely, with quartz sand. Was well washed therefrom, and then 
ultimately separated by the magnet. Two substances were present,—one 
granular and hackly, not strongly magnetic ; the other, amounting to about 
one twentieth of the bulk, was strongly magnetic, of brilliant lustre, and 
apparently in octahedra, or fragments thereof. 
The portion analysed was almost totally the jormer of these, there being of 
the latter an insufficiency for analysis. 
The first analysis was by fusion with potassium bisulphate ; the second by 
long continued treatment with sulphuric acid. 
i. 2. 
Titanic Acid, . ; ‘ . 14°4 GIL 
Alumina, , : : te Babe 11°465 
Ferric Oxide, . 5 : Sh arse QrAl 39° 285 
Manganous Oxide, . : : 6 6 
Lime, : ; ; mn OO 7:°896 
Magnesia, : : ; ee alt diigeto) 
Silica, ; ‘ : » gon 24° 
101:°516 100 - 946 
7. Found about the year 1850, in large quantities on the sea-shore at 
Granton, Mid-Lothian, about a fourth of a mile westward of the breakwater. 
It lay, as is usual with these black sands, on the surface, and could be collected 
by merely scraping with the hands. It was afterwards separated from sea-sand 
