MICROPALH ONTOLOGY OF POSTGLACIAL DEPOSITS. 48] 
Sample 8 (260 cm.): 24,5 B., 2 Pinus, 2 Q., 1 cf. Ulmus; 55 
pollen, 20 cf. Salix; Chenopodiace pollen. 
Sample 9 (297 em.): 3 A. (—13:5 per cent.), 13 B. (=59 per cent.), 
5 P. (=23 per cent.), 1 Q. (=4°5 per cent.) ; 8 grass-pollen, 16 cf. 
Salix ; Chenopodiaceæ pollen. 
Sample 10 (310 em.) : 1 A. (?), 18 B., 10 P. ; 1 Galium sp. ; grass- and 
cf. Salix-pollen not counted. 
Sample 11 (335 em.) : 26 B., 3 P.; 2 Corylus; 1 Polypodium vulgare ; 
47 spores without exospore. 
Sample 12 (347 cm. below the surface): 1 B., 9 P.; 27 cf. Salix : 
2 Polypodium vulgare ; 22 spores without exospore. 
grass- 
The solid wood found in the section proves the presence of trees, since 
the wood cannot have been drifted. As to the scantiness of pollen, the com- 
paratively small area of the Orkneys is to be considered. Exact analyses for 
places so situated demand much time and much work. In the above figures, 
which, however, do not permit of percentages being calculated, it is to be 
noted that Corylus occurs only close to the bottom of the sequence. It is 
therefore to be inferred that evolution occurred here along almost the same 
lines as in the Hebrides and Shetlands. The subject will be dealt with 
later. 
Peat Moss No. 25. 
A rather large moss of the High Moor type, which lies west of Kirkwall 
(S. of Lesliedale, N.N.W. of Windbreck) and is drained towards the S.E. 
into Scapa Bay. Altitude above sea-level about 60 m. As was the case in 
the last-mentioned moss, the greatest part of the surface was clothed with a 
dense growth of a pure Callunetum. In places, as subordinate vegetation, 
Cardamine pratensis, Erica cinerea, Narthecium, Schenus nigricans, etc. 
was found. 
Sequence of strata :— 
A. 30 em. Calluna peat, dry. 
B. 40 em. Sphagnum peat, H 4-5. 
C. 180 cm. Do., H=8, in parts rich in Eriophorum vaginatum remains ; 
the lowest part somewhat resembles Carex peat, 
D. 125 em. Carr peat (cf. Tansley, 1911) with a great amount of dy; 
when the bore was at 290 cm. below the surface, methane poured out. 
E. 15 em. + clay ; grey, the upper part darker than the lower. 
Six samples have been analysed. The only tree-pollen seen in all these 
samples is that of birch. Ericacex tetrads were not counted. 
Sample 1 (135 em. below the surface): 3 Alnus, 3 Betula, 1 Fagus : 
2“ Salix?” 
Sample 2 (185 em.) : 6 Betula, 4 Pinus. 
2N2 
