290 THE MIcROSCOPE. 
marked by several fine, transverse ridges. Anteriorly, there are 
two sub-parallel longitudinal ridges, which, however, ultimately 
converge and form an apex at the tip. The extreme posterior 
border of the tongue (which in shape represents an isosceles tri- 
angle, the apex being forward), is fringed with rather large, soft, 
fleshy, conical papillee, the points of which are directed back- 
wards and inwards. Numerous course, retroverted, cone-shaped 
papille (averaging 1 mm. in height) are also present on the 
upper posterior surface of the larynx. 
The under surface is smooth and unmarked by raphe or 
groove. 
The investing membrane is blue-black in color, but loses its 
pigmentation and becomes almost white at the sides and tip. 
TO MAKE A MICROSCOPICAL AQUARIUM FOR 
WINTER USE. 
DR ALFRED C. STOKES. 
66 HAT can be done with the microscope in the winter?” 
is a question not seldom asked, but seldom answered 
by the microscopist, except with the comprehensive word, “ Eve- 
rything.” A detailed reply would consume a winter in the tell- 
ing. A serious student can find an endless supply of micros- 
- copical objects. The single plant that stands in the sunny win- 
dow would afford enough material for months of charming 
investigation. Even the structure of a single leaf would supply 
work for many an hour, and a subject for an important essay. 
There are appendages to certain leaves that ought to be investi- 
gated by those who have access to the plants, and some botani- 
cal statements corrected or confirmed. In reference to the leaves 
of the “Ice Plant” (Mesembryanthemum erystallinum), Alphonso 
Wood, in his Descriptive Botany (Flora Atlantica), says: “Air 
bubbles beneath the epidermis appear like dew or frost.” But 
are they air bubbles? 
eae Rey. J. C. Wood, in his “Common Objects of the Micros- 
cope, ’ refers to the great abundance of material at all times: 
“No one who possesses even a pocket-microscope of the most 
limited powers can fail to find amusement and instruction even 
though he was in the midst of the Sahara itself. There is this 
great advantage in the microscope, that no one need feel in want 
