476 MR. G. ERDTMAN: STUDIES IN THE 
Prat Moss No. 19. (Text-fig. 14.) 
On the seashore at Callernish, S.W. of Loch Bhàrrabhat, a number of 
turfy mounds are to be found scored by great crevices, the result of 
desiccation. The thickness of these mounds is about 175 em., and their base 
is regularly washed by the tide at high water. The pollen-character shows 
these deposits to be a little older than the A-zone. If this synchroni- 
zation could be established by further investigations, and if the A-zone really 
is a part of the Lower Forest, these peat deposits would be of importance for 
solving the problem of the rise and fall of land in the Outer Hebrides. 
Parts of eastern Lewis were submerged in postglacial times, but possibly 
TEXT-FIG. 14. 
| | 
17 — | - | — En Gun 
] {| EN » 
| mM 
—o— Alnus. —o— Betula. —e—— Pinus. een Ulmus, 
Quercus,  ----.. Tilia. --g-- Corylus. 
the western part was not. Sphagnum remains are quite common in the 
peat, and it is obvious that the * Salir" percentage is greater than usual 
(sample 3, 9 per cent.; 2, 13 per cent.; 1, 30 per cent.). 
Peat Moss No. 20. 
Situated on the west coast of Lewis, on the right bank of the River Arnol, 
between Loch Arnol and the Barvas-Carloway road. Vegetation: a firm 
meadow with Anthoxanthum, Festuca ovina, Pedicularis silvatica, Plantago 
maritima, ete. Samples were not collected at a greater depth than 160 em. 
below tbe surface. It was possible to analyse a specimen from that depth, 
in spite of its great content of sand-grains ; it showed the following pollen- 
spectrum : Alnus 15 per cent., Betula 85 per cent. : Corylus 2:5 per cent. : 
* Salix” 15 per cent. : Myriophyllum alterniflorum 5 per cent. 
alia >} ; M mop 
