Completely set

Usage examples of cemented.

Thin slips of wood were cemented on more or less steeply inclined glassplates, at right angles to the radicles which were gliding down them.

A pinna was cemented with shellac on the summit of a little stick driven firmly into the ground, immediately beneath a pair of leaflets, to the midribs of both of which excessively fine glass filaments were attached.

In order to learn whether the tentacles or glandbearing hairs circumnutate, the back of a young leaf, with the innermost tentacles as yet incurved, was firmly cemented with shellac to a flat stick driven into compact damp argillaceous sand.

To the end of the glass filament an excessively minute bead of black sealingwax was cemented, below or behind which a bit of card with a black dot was fixed to a stick driven into the ground.

The apex by thus rising, was in one instance able to surmount a bristle cemented across an inclined glassplate.

Moreover, some of the four failures can hardly be considered as really failures: thus, in one of them, in which the radicle remained quite straight, the square of thin paper was found, when both were removed from the apex, to have been so thickly coated with shellac that it was almost as stiff as the card: in the second case, the radicle was bent upwards into a semicircle, but the deflection was not directly from the side bearing the card, and this was explained by the two squares having become cemented laterally together, forming a sort of stiff gable, from which the radicle was deflected: in the third case, the square of card had been fixed by mistake in front, and though there was deflection from it, this might have been due to Sachs' curvature: [page 149] in the fourth case alone no reason could be assigned why the radicle had not been at all deflected.

But we have seen with radicles growing down inclined plates of glass, that as soon as the tip merely touched a slip of wood cemented across the plate, the whole terminal growing part curved away, so that the tip soon stood at right angles to its former direction.

Finally, to ascertain whether the lobes independently of the petiole oscillated, the petiole of an old leaf was cemented close to the blade with shellac to the top of a little stick driven into the soil.

The petiole of a leaf was fixed to a cork support, close to the point whence the four pinnae diverge, with a short fine filament cemented longitudinally to one of the two terminal pinnae, and a graduated semicircle was placed close beneath it.

On the following day the stem was cemented to a [page 378] stick, and the movements of two leaves were traced on a vertical glass during 72 h.

Nevertheless, as the part within the tube might possibly bend a very little, fine rigid rods or flat splinters of thin glass were cemented with shellac to one side of the upper part of 15 cotyledons.

A long and very thin glass filament was cemented horizontally to the stem close above the second joint, 3 inches above the ground.

The basal internode, 2 inches in length, was cemented to a stick to prevent any possibility of its circumnutating.

The upper part of 8 young cotyledons of Phalaris were made rigid by being cemented to thin glass rods, so that this part could not bend in the least.

Even slight pressure suffices, such as a bit of card cemented to one side.