A "crested" furrow is obtained by the use of a share, the wing of which is set at a higher altitude than the point, but this type of furrow is less generally found than the "rectangular" form obtained by a level-edged share, which leaves a flat bottom.
Plaice, like other flat-fishes, prefer a sandy flat bottom to a rocky ground, and occur in suitable localities in great abundance; they spawn early in spring, and are in finest condition in the month of May.
Faraday observed that a large drop of mercury, resting on the flat bottom of a vessel containing dilute acid, changes its form in a remarkable way when connected with one of the electrodes of a battery, the other electrode being placed in the acid.
A noteworthy feature of this area is the series of trap rock ridges, between which the Passaic river makes its irregular way through a region of flat bottom lands.
The latter are very commonly made of old flat bottom rails, laid with the flat of the flange against the wall.