Mountain features

Usage examples of summits.

Cotyledons a little under threequarters of an inch in height were selected for trial: six had their summits protected from light by tinfoil caps, .

For instance, all the young leaves near the summits of several stems stood almost horizontally at 8 A.

Extremely fine filaments of glass, bearing two minute triangles of paper, were fixed to the summits of young stems, frequently to the hypocotyls of seedlings, to flowerpeduncles, radicles, etc.

To my mind, it is quite possible that all these islands, emerging from this vast ocean, are but the summits of a continent, now submerged, but which was above the waters at a prehistoric period.

Glands and summits of the tentacles alone sensitive--Transmission of the motor impulse down the pedicels of the tentacles, and across the blade of the leaf--Aggregation of the protoplasm, a reflex action--First discharge of the motor impulse sudden--Direction of the movements of the tentacles--Motor impulse transmitted through the cellular tissue--Mechanism of the movements--Nature of the motor impulse--Reexpansion of the tentacles.

Sometimes it seemed that we had already attained the highest peak, for we saw clear sky above it, but we were always wrong, because when we got to the top of that one we would find that there were new summits rising beyond it.

Ribbons of snow gusted off the wind-raked summits and glittered white against a cobalt sky.

The young leaves on the summits of the stems close up at night so much, as often to resemble large buds.

These were placed at different times on the summits of 24 cotyledons, and they extended down for a length of between .

The summits and the basal parts were thus left fully exposed to a lateral light during 8 h.

With four of these seedlings the summits were exposed for a length of .

The summits of the four other seedlings were exposed for a length of .

Under these circumstances, the whole lower halves of the cotyledons, which had their summits enclosed in the tubes, were fully exposed to the light of the sky, whilst their upper halves received exclusively or chiefly diffused light from the room, and this only through a very narrow slit on one side.

Other seedlings of the same plant had their summits painted with Indian ink with the same negative result.

In thus moving, the long claws on their summits carry with them some earth.