286 Tables (^the Var iation of the Magnetic Needle, 
Tab. IX. — Continued, 
Year of 
Magne- 
Year of 
Magne- 
Names of Places. 
Observa- 
tic Va- 
Names of Places. 
Observa- 
tic Va- 
\ 
tion. 
riation. 
tion. 
riation. 
Cape of Good Hope, 
Madagascar, 
1724- 
16°18'W. 
Antongill j 
1661 
22°30'W. 
1752 
19 0 
Bay, 1 
1761 
18 0 
1768 
19 30 
Fort Dau- j 
1661 
19 0 
Table Bay, 
1772 
1775 
20 26 
21 14 
phin, - ( 
Foul Point, 
1761 
1762 
22 74 
16 45 
1788 
23 16 
1 
1600 
16 0 
1 
1 
1792 
24 30 
St Sebastian, j 
1610 
16 40 
1 
1804 
25 4 
Cape, 1 
1722 
19 1 
1682 
0 0 
1 
1722 
18 36 
Gor^e, - 1 
1769 
12 15 
f 
1610 
19 50 
\ 
1772 
10 30 
St Mary’s Island, J 
1722 
19 53 
r 
1610 
17 35 
near Madagascar, 1 
19 52 
Guardafui, Cape, j 
1612 
1721 
17 34 
11 11 
1 
Nosf-Gombi, an ^ 
19 25 
20 0 
1 
1723 
12 34 
island near Ma--< 

19 45 
Hermanas Island, j 
1610 
18 55 
dagascar, ( 

19 5 
near C. Guardafui, ( 
1612 
17 23 
Salee Roads, 
1735 
12 19 
1600 
1604 
8 0 E. 
7 45 
Sierra lieo'ne, -1 
1608 
1725 
1 50 E. 
5 12 W. 
1610 
7 13 
Sunken Rocks, f 
1606 
21 0 
1623 
6 0 
S. Lat. 31° 48^ | 
1677 
0 40 
1611 
16 0 
1691 
1 0 AY. 
1612 
17 22 
St Helena, Island 
1724 
7 30 
1674 
17 0 
©f, 
1764 
11 38 
1723 
11 25 
1768 
12 47 
Socotra, Island of, - 
11 36 
1775 
14 18 
11 38 
1785 
12 18 
12 4 
1789 
15 30 
— 
11 57 
1796 
15 484 
— 
12 20 
1806 
17 18 
1776 
8 6 
Madagascar, 
St Thomas, Isle f 
1726 
14 48 
1607 
15 30 
of, . { 
1726 
14 32 
Augustin’s 
1607 
15 26 
Tripoli, 
1733 
13 22 
1610 
14 50 
Trinidad, Island ) 
Bay, 
1611 
15 11 
S. Lat. 20° 45’ 1 
1615 
12 0 E. 
1613 
15 40 
N . Long 29° 30', j 
1721 
23 48 
Art. XV.— ~0^^ the Forms qf Crystallisation of Sulpliato-tri- 
Carbonaie (fLead. By 'W. Haidikger, Esq. E. E. S- E. ^ 
C^ouNT Bournon seems to have been the first author who 
erected the lamellar varieties of lead-ore from Leadhills in- 
to a separate species, under the name of Plomh Carbonate 
* This paper is a brief abstract of the original memoir 'read before the Royal 
Society of Edinburgh, on the IGth February 182t. The crystallographic develop- 
