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ZOSTERIFORM

Resembling herpes zoster.

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ZEOLITES

are natural deposits of an opaque vitreous character abundantly diffused in nature, which may be described as double hydrated silicates of aluminium and calcium. When treated with acids they partially dissolve, leaving the silica in a gelatinous state. Stilbite and analcime are two zeolites.

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ZAHARBAD

Vernacular for trypanosomiasis.

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ZONE ZONA

Z., Adoral, the zone of cilia which circumscribes the peristome or frontal plain of infusoria. Z., Barnes

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ZYGAPOPHYSIS

Z., Postaxial. See Postzygtipophyses Z., Preaxial. See Prezygopophysis Diet..

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ZIRCONS

Natural silicate of zirconium ZrSi04j found in Brazil and elsewhere. One such deposit, known as brazilite, is said in a semimanufactured form to contain about 80 per cent, zirconium oxide. This product is employed as a refractory in the making of “zirkite” bricks and cement. Another Brazilian deposit is known as orvilliie, and contaius about 72 per cent. ZrOa.

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ZAKAVASKA

The name given in Russia to the grains used as a ferment to produce kephyr or kumiss.

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ZONULITIS

Inflammation of Zinn

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ZYGOMYCETES

A group of fungi characterized by sexual reproduction through the union of two similar gametes zygospores.

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ZINC FORMOSUL

is described as basic zinc formaldehyde sulphoxylate, being a greyishwhhe powder, insoluble in water, but which exercises reducing power when boiled with very dilute a< ids, or at high temperatures in their absence. It is advocated for use in the autoclave and Twitchell processes of fat splitting, and is claimed to assist in the blearhing of the resultmg g jcerine.

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