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YTTRIA

1 ttrium oxid.

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YTTRIFEROUS

Yielding yttrium.

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YOUNG FUSTIC

The heartwood of a sumac used in the leather industry.

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YOHIMBINE

A crystalline poisonous alkaloid, extracted from Coryn&nthe yohimbi, used in medicine.

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YTTERBIUM or NEOYTTERBIUM

Atomic weight, 1735. A very rare element found in the mineral gadolinite and associated with yttria. An oxide 3 is known, also a chloride and a sulphate 3.

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YLANG YLANG

A yellow essential oil distilled from the flowers of Cananga odorata of which varieties are known as “cananga” and “manila” oils. They contain methyl and benzyl acetates and benzoates, linalool, geraniol, eugenol, etc. The sp. gr. of ylangylang is given as 09 to 096, and its rotation 170 to 50 degrees, varying with the source of the oil, which is soluble in alcohol and ether, and is used in perfumery.

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YELLOW WATER LILY

(Nuphar. Nat. Ord. Nymphaeaceae).This is a hardy water lily of some merit available in several forms. It succeeds best where there is about a foot of water above it. Its general culture is the same as that outlined in our article on Water Lilies, which see. We recommend the following species : Nuphar advena.Yellow flowers throughout the summer. N. luteum (Brandy Bottle). Yellow flowers with strong spirituous odour throughout the summer. N. minimum. Yellow flowers from June to July. N. polysepalum.Yellow flowers from June to September.

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YUCCA

(Nat. Ord. Liliacea). This is a genus of most useful evergreens for the rock garden or wild garden as well as for the general borders and for sub-tropical bedding. Most of them are of easy culture and hardy enough to stand an average English winter, though in ultra-cold districts some protection may be advisable. Any good, light, rich, sandy soil suits them admirably, and they may be successfully propagated by seeds, cuttings, and suckers in the usual way. For bedding purposes they should be raised in the same manner as halfhardy annuals or propagated by cuttings the previous seasoni What to Grow.All those mentioned below bear white flowers from July onwards to September. Owing to the popularity of the genus many synonymous species are now offered, but to add these would be waste of space and would confuse readers considerably. The following may be regarded as distinct : Yucca angustijolia, and its variety stricta (2-3 ft.) ; Y. filamentosa, and its varieties flaccida and variegata (Silk Grass, averaging 14-3 ft. in height); Y. glauca (2-3 ft.); Y. gloriosa, the well-known Adams Needle, and its varieties Ellacomhei and variegata (4-6 ft.) ; Y. orchioides and its variety major (1-3 ft.) ; Y. recurvifolia and its variety variegata (3 ft.) ; and Y. rupicola (1J-3 ft.). In addition to the above species the following half ai dozen of the best hybrids should be grown if space admits : Albella, arnottiana, Orion, sanderiana, Sirius, and Vomereuse. All have white flowers.

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YULAN

(Magnolia conspicua).See Climbing and Trailing Plants and ITrees.

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YAMS

We do not recommend our readers to attempt the cultivation of these in this country.

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