xual reproduction, 36.
sexual organs, 36.
fertilization, 36.
resting spores, 37.

Venus's fly-trap, 192.

_Verbascum_. See "Mullein."

_Verbena_, _-aceae_, 218; Fig. 121.

_Veronica_, 217; Fig. 120.

Vervain. See "_Verbena_."

Vessel, 121, 135, 150, 175, 177.

_Viburnum_, 223; Fig. 124.

_Victoria regia_, 190.

_Vinca_. See "Periwinkle."

Vine, 199.

Violet, 192; Fig. 104.

_Viola_, _-aceae_. See "Violet."

Virginia creeper, 171, 199.

_Vitis_. See "Grape."

_Vitaceae_. See "Vine."

_Volvox_, 12, 20; Fig. 10.

_Volvocineae_, 12, 19.

Wall-flower, 192.

Walnut, 183.

Wandering-Jew, 157.

Water fern, 117.

Water-leaf, 214; Fig. 118.

Water-lily. See "_Nymphaea_," "_Castalia_."

Water-milfoil, 206; Fig. 113.

Water mould. See "_Saprolegnia_."

Water net, 24; Fig. 11.

Water-plantain, 167.

Water-shield, 190.

Water-starwort, 200.

Wax-plant, 220.

Wheat, 78.

Wheat rust, 78, 81; Fig. 47.

_Whitlavia_, 214.

Wild ginger, 224; Fig. 126.

Wild onion, 230.

Wild parsnip, 202.

Willow, 181-183; Fig. 96.

Willow-herb, 206, 226; Fig. 113.

Wing (of papilionaceous flower), 208.

Wintergreen, 211.

_Wolffia_, 159.

Wood. See "Xylem."

Wood-sorrel, 197; Fig. 107.

Xylem, 110, 124, 135, 150, 173, 176.

Yam, 154.

Yeast, 63, 64; Fig. 37.
cause of fermentation, 63.
reproduction, 64.
systematic position, 64.

Yew, 141.

_Yucca_, 153.

_Zanthoxylum_. See "Prickly ash."

_Zingiber_, _-aceae_. See "Ginger."

Zooelogy, 2.

Zooespore, 25, 37, 58, 62.

_Zygnema_, 33; Fig. 19.

Zygomorphy, Zygomorphic, 164, 215, 226.

NATURAL SCIENCE.

_Elements of Physics._

A Text-book for High Schools and Academies. By ALFRED P. GAGE, A.M.,
Instructor in Physics in the English High School, Boston. 12mo.
424 pages. Mailing Price, $1.25; Introduction, $1.12; Allowance for
old book, 35 cents.

This treatise is based upon _the doctrine of the conservation of
energy_, which is made prominent throughout the work. But the leading
feature of the book--one that distinguishes it from all others--is,
that it is strictly _experiment-teaching_ in its method; _i.e._, it
leads the pupil to "read nature in the language of experiment." So far
as practicable, the following plan is adopted: The pupil is expected
to accept as _fact_ only that which he has seen or learned by personal
investigation. He himself performs the larger portion of the
expe