490 MR. G. ERDTMAN: STUDIES IN THE 
This table shows the homogeneity of the different parts of a preparation, 
as was shown by von Post (1916) and the author (1921, p. 21, also as 
quoted by Docturowsky, 1923). 
The lowest sample (261 em. below the surface) contained, unlike that just 
mentioned, 6 pine-pollen grains (20 per cent.) ; also 19 Betula (63 per cent.), 
3 Quercus, 3 Corylus, T ef, Salix and 1 cf. Alnus. Thus the moss must be 
younger than mosses such as Nos. 34 and 36. 
Prat Moss No. 36. 
Situated at the south border of Voe Loch (117 feet above sea-level), 
between the loch and the Voe-Lunna road. Depth of the deposit 147 em. 
À sample 7 cm. above the sand-bottom exhibited the following pollen- 
spectrum: Alnus 30 per cent., Betula 60 per cent, Pinus 33 per cent., 
(Quercus LI per cent, Ulmus 5 per cent.; Corylus 15 per cent., cf. Saliw 
50 per cent. PF=40, 
Pear Moss No. 37. 
A deposit, 262 cm. thick, resting on rock situated in the dale of Sandgarth 
Burn south of Dales Voe, due west of the road between Wester Scord and 
Djüpa Gill. A sample was taken from the highly-decayed base (260- 
202 em. below the surface). The analysis showed 3 alder, 4 birch, 8 pine, 
and 2 hazel pollen-grains (representing respectively 20 per cent., 27 per 
cent., 03 per cent., and 13 per cent.). 
PEAT Moss No. 38. (Text-fig. 18.) 
In order to get a representative example of the * hill-peat," which covers 
the greater part of the Shetland kames and hummocks to a depth of 3 m. or 
occasionally 4 m., a series was collected from the wall of a peat-hag newly 
dug in the neighbourhood of Firths Voe. Tt lies immediately S. of the road 
which isa little to the W. of Firths Voe and near the stream from Sand 
Water and Bordigarth Loch. This deposit is the most northerly one in- 
vestigated. The exposure had a depth of 180 em.; below this specimens 
were obtained with the bore, the rock-bottom being at a depth of 365 em. 
beneath the surface. 
The peat was much decayed, a yellow-brown strip of Sphagnum peat 
(65-75 em, below the surface) excepted. The lowest part contained many 
twigs ; the layers immediately above the base were dark, probably very 
compressed and difficult to bore. 325-331 cm. beneath the surface was a 
layer of grey sand. 
The diagram exhibits clearly the decrease of the pollen frequency from 
the base (PF=5-7) to the upper layers (PF=0). The great amount of 
Corylus pollen in the 3 lowest samples is interesting as a parallel to features 
already mentioned from the Hebrides, the Orkneys, and Ross. In sample 5 
