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The members of the group are all tetrads, and have eight funnels, opening on the eight faces of the octahedron.
OCCULT CHEMISTRYANNIE BESANT AND CHARLES W. LEADBEATER
In some the spores were uniform, all developing equally in numerous tetrads.
ANCIENT PLANTSMARIE C. STOPES
In each sporangium large numbers of these tetrads develop and all the ripe spores seem to have been of one size.
ANCIENT PLANTSMARIE C. STOPES
If there are no sarcina, but tetrads or staphylococci (rarely merismopedia), then the division is in two planes.
THE FUNDAMENTALS OF BACTERIOLOGYCHARLES BRADFIELD MORREY
When such rings do occur their genesis is very obscure, and at no time do they present the appearance of “tetrads.”
More contracted cross and diamond-shaped tetrads; linin bands shown in 60, where element x is also present.
Diamond-shaped and contracted cross-shaped tetrads from metaphase of first maturation mitosis, showing linin connections.
A whole Irish law-book is composed in the form of heptads; while triads, tetrads, &c., occur in every part of the Laws.
Occasionally one of the tetrads takes the form of a cross (fig. 249).
STUDIES IN SPERMATOGENESISNETTIE MARIA STEVENS
In one stage these double U's look much like tetrads (fig. 138).

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