Square of card affixed with shellac: after 24 h. no effect.

The squares, etc., were most commonly affixed with shellac, but in 19 cases with thick gum-water.

Square of card affixed with shellac: after 8 h. radicle curved at right angles from the perpendicular and from the card.

Square of card affixed with shellac: after 24 h. no effect, but the radicle had not grown well and seemed sickly.

This fact having been ascertained, little squares of the card-like paper were affixed with shellac, on several occasions, to the tips of 68 radicles.

Squares of card affixed with shellac: after 24 h. radicles of both curved at about 45o from the perpendicular and from the cards.