of the Royal Society of Edinburgh, 4125 
an expert observer will easily take 20 altitudes. Two sets of ob- 
servations from Makerstown, in Roxburghshire^ are calculated 
fully, and accompany the memoir. The following is the result: 
10th February, mean of 17 Latitudes, 55° 34' 18".6 
9th 17 55 34 14.S 
Mean Latitude of Makerstown, 55 34 16.4 
15. Descriptio7i of a Vegetable Impression found in the Quarry 
of Craigleith. By Thomas Allan, Esq. F. R. S. Lond. 
& Ed. ; p. g35,-238. With a Plate. 
The beautiful vegetable impression described in this paper, 
belongs to some unknown order of plants. The bark resembles 
that of a vegetable connected with the palm tribe; but it differs 
from those commonly met with, by having circular marks ar- 
ranged in a line along the surface, which appear to be the im- 
pressions of flowers or fruit. The specimen is 21 inches long, 
and 14 broad, and the diameter of the circles a little more than 
three 'mohQ^. The drawing which accompanies the paper, is 
from the masterly pencil of E. K. Greville, Esq. 
16. Accowit of the Native Hydrate Magnesia^ discovered by 
Dr Hibhert in Shetland, By Davjh Brewster, LL. D. 
F. R. s! Lond., & Sec. R. S. Edin. ; p. 239,-242. 
This paper is printed in the present Number, p. 352. 
17. Description of a Magnetimete7\ being a New Instrument 
for measuring Mag^ietic Atti'actions^ and finding the dip of 
the Needle^ ^c. By William Scoresby, Esq. /ww. F. R. S. 
Ed. ; p. 243.-250. With a Plate. 
An abstract of this paper is published in this Number, p. 360. 
18. Account of the Establishment of a Scientific Prize, By the 
late Alexander Keith, Esq. of Dunottar, in a Letter from 
the Trustees to Sir Walter Scott, Bart, P. R, S. &c. 
See this Number, p. 358. 
Art. XXXV . — Proceedings of' the Royal Society of Edin- 
burgh, (Continued from p. 395.) 
Dec, 18. 1820. — T^PIE continuation of the account of the 
Journey of Alexander Scott through Africa was read. See thivS 
Number, p. 225. 
