Part 27

X-Ray. See Röntgen ray.

Xylogy. The study of the structure of wood.

Yttrium. A metallic element. Symbol: Y or Yt.

Zinc. A metallic element. Symbol: Zn.

Zirconium. A metallic element. Symbol: Zr.

Zoöchemistry. The study of the constituents of animal bodies.

Zoölogy. The science of animals.

Zygote. A cell formed by the joining of a male and a female cell, capable of developing into a new individual.

Zymosis. Fermentation.

Zymurgy. The chemistry of fermentation processes.

Transcriber’s Notes:

Italics are shown thus: sloping.

Variations in spelling and hyphenation are retained.

Perceived typographical errors have been changed.