The top and bottom rows of the xylem rays are often developed as irregularly-thickened radially-elongated tracheids which serve for the radial conduction of water, and communicate with the ordinary tracheids of the secondary xylem by large bordered pits.
In the spring-time, shortly after bottling, the rise in temperature produces a secondary fermentation, and this converts the sugar into alcohol and carbonic acid.
C. Benson on the results of English secondary classical education, From a College Window, 3rd ed., 1906, pp. 154-177).
As an independent pursuit, live-stock breeding is carried on by the Russians in eastern Transbaikalia, by the Yakuts in the province of Yakutsk, and by the Buriats in Irkutsk and Trans- Lave baikalia, but elsewhere it is secondary to agriculture.
The primary, secondary and tertiary amines may be readily distinguished by their behaviour with various reagents.
B, Echinococcus, showing at a and b the formation of secondary bladders, which at c are forming scolices.
These secondary judgments of nonexistence are partly like and partly unlike primary judgments of existence.
The same remarks apply to the fifth bow, which differs from the third and fourth in being situated in the same part of the sky as the primary and secondary bows, being just above the secondary.
Primary phloem can be recognized with certainty in favourable cases, the question of the formation of secondary phloem by the cambium is not yet fully cleared up. In the Lepidodendron fuliginosum of Williamson, shown by its leaf-bases to have been a Lepidophloios, the secondary wood is very irregular, and consists largely of parenchyma.
In others the secondary phloem is produced more abundantly in those places where the secondary xylem is deficient, so that the stem remains cylindrical in section, the phloem occupying the bays left in the xylem mass.