b 
NATURAL HISTORY CALENDAR. 327 
we know of. For fresh-water aquaria, use glass jars and dishes. 
Large aquaria can be made of glass set in a soapstone frame, made 
water-tight by cement. Any glazier can make one. Shirley Hibbard 
thus describes a large tank :— 
ent of a dwe Mh, ora rE an oblong tank, EE 
e min 
0 back 
of eg z y — ee ‘oom _— jarra Siepen form ı for such a body is that of the 
do k d depth, so that if it were 
cut “site two equal parts, two cubes would be formed. The s must be set in n grooves in 
the slate, and ane outaiie with zine or taraia piers: of ae wood. The best Samai is 
white-lead putty, or iti hich it 
my power to inform the reader, If a coating of shell-lac, dissolved in naphth d made 
a a paste with whiting, were laid: over the Wht te kesa cement, ae water roula be kept 
Theus Paat E Ra page hi re fix pock-w: 
rkr 
OTK, 
the cement t } o glass. ` But if rock-work is 
not tho , the sl ate ends may be dispensed wii on and the vessel may be co: 
posed winy o of glass, except the bottom, which may be of slate or wood. I have seen 
some handsome tank posed wholly of w and glass; it is only necessary to choose 
well-sea q oe and unite the joints very perfectly. 
L. Q., Pennsylvania. — We can scarcely tell from your drawing what 
the object can be. It is probably a Polyzo6n, ep possibly a species 
of Lophopus, mentioned in the June number of the NaTuRALIsT, and if 
50, is very rare, and specimens would be very mie. . 
NATURAL HISTORY CALENDAR. 
inition 
Insects or AvGust.— During this month great multitudes of 
bugs (Hemiptera) are found in our fields and gardens; and to this 
group of insects the present chapter shall be devoted. They are nearly 
all injurious to crops, as they live on the sap of plants, stinging them 
with their ma suckers. Their continued attacks cause the leaves 
to aceon 
Tho ee at certain years, desolates our wheat-fields. We 
have a the heads black with these terrible pests. They pierce the 
grain, extract the sap, causing it to shrink and lose the greater part 
ofits bulk. It is a most insidious and difficult foe to overcome. 
The various leaf- hoppers, Tettigonia and Ceresa abound on the 
leaves of plants, sadly blighting them; and the Tettigonias frequent 
