Veil, partial

The wine yeast, Saccharomyces fermentati, is able to form a film or veil on the surface of dry white wines of about 15-16% alcohol. This yeast produces agreeable smelling and tasting substances which dissolve in the wine and give it the aroma and flavor characteristic of Spanish fino sherries. To provide itself with energy for growth while in the film form on the surface of the wine, the yeast utilizes some of the oxygen from the atmosphere above the wine in the partially filled butt or barrel to oxidize some of the ethyl alcohol from the wine. The ethyl alcohol of the wine is not completely metabolized to carbon dioxide and water, however, but is oxidized to acetaldehyde—probably the principal compound in the complex mixture responsible for the aroma of this type of appetizer wine. 

Harvest Stage Directly before the partial veil stretches. 

GENERAL DESCRIPTION A robust, thick fleshed Agaricus species, with thin gills that are pinkish when young, and darkening to sepia and then chocolate brown in age. The cap is characteristically brownish, whitish or cream colored. The cap surface is smooth to appressed squamulose and dry. This species has a short, thick stern which is adorned with a persistent membranous annulus from a well developed partial veil. Its spores are chocolate brown in mass. 

Fruitbodies can be moderately large when mature. A partial veil is absent. The spore deposit is pale pinkish Tan. 

Harvest Stage When the cap becomes convex and soon after the partial veil ruptures. 

Harvest Stage Directly before or as the partial veil tears. (Note that young mushrooms have a much better flavor than mature ones). 

The Tholos of Delphi is similar to images painted in frescoes of Pompeii. Bedroom B of the Villa of the Mysteries and Bedroom M of the Villa of Publius Fannius Synistor, at nearby Boscoreale, both show the mysterious Tholos, partially concealed from view by a veil. We shall have more to say of the Tholos and its enigmatic labyrinth of columns later in this chapter. 

At the same time as student teachers are required to buy into a version of teaching which encourages them to control students behaviours by modifying their own, they are kept under a veil of uncertainty about whether they will make it as teachers, by ensuring that their knowledge of teaching is always partial ... 

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