Page:Popular Science Monthly Volume 74.djvu/514

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510
THE POPULAR SCIENCE MONTHLY

Laminaria and the perforated Agarum, belonging to the same group. The surfaces of the islands bordering the water stretches and of the peninsulas pushing seaward from the mainland are covered with evergreens, while as one passes up the sounds towards the mainland proper this evergreen growth gives place to deciduous trees. Hence, within a comparatively short distance, the botanist may have a wide range of vegetation.

Out "upon the sunny seas" float Aurelia flavidula and Cyanea arctica in countless numbers. Melicerta and Pteropods occur during

PSM V74 D514 Typical rock structure creating tide pools.png

Fig. 4. Typical Rock Structure forming the Tide-pools.

the greater part of the season, and these may be collected in a rowboat within the sounds themselves. On shallow banks of sand exposed entirely at low tide Echinarachnius parma may be collected in quantities, and with great ease. Strongylocentrotus dröbachiensis is dredged by the bushel within a mile of the laboratory, while the same dredgings bring up Dentalium, Corymorplia, Chalina, Edwardsia, Pentacta, Terebratulina, Pecten tenuicostata, Boltenia and other classics.

The one-day trips from the laboratory may be undertaken in one of many directions. Twenty miles is generally a recognized limit. The map reveals the possibilities of a day's collecting. All the trips are in