we possess of pig's skin and stirrups to keep them square and trig

A few examples are given in Fig. 21, but a point ought to be emphasized: the channels delineated by the scalariform junctions (with very frequent MS complexes) are closed at one end (by a septate junction in homocellular junctions, or are blind in autocellular junctions) and open at the other end, either at the basal pole of the cell (facing the hemolymph) or in a sistem of intercellular spaces (intercellular sinus of Oschman and Wall, 1969), forming a compartment more or less isolated from the hemolymph (for discussions concerning the relationship between the intercellular sinus and the hemolymph, see Oschman and Wall, 1969; Wall and Oschman, 1973, 1975; Noirot and Noirot-Timothe/e, 1976).

[T]he method introduced by Mr. [Benjamin] Gibbons in Staffordshire of exhausting the foul air, by air-heads cut in the lop of the coal, connected with a channel in the side of the shaft, terminating in a chimney on the surface, was received as a decided improvement upon the ordinary system in use in that coal-basin, where the extraordinary thickness of 30 feet of the vein coal renders a peculiar plan indispensable.

Google announced its breakthrough in a paper published in the science journal Nature. And its claims have raised the hackles of researchers at competing companies who believe the Silicon Valley giant is inflating its accomplishment.