THE r 
CHRONICLE. 
080 
seeding themselves to death. But this active six-legged larva, w h jointed antenna and long | females. m 
ing rai 3 a correct ; ete the extraordinary fertility pp rego at the le of the body, it becomes an | generically from the common 
of thees plant i om the cause, but generally the which all the limbs are absorbed, with the | generic name of Sacciphantes, consideri 
pre-oxi debility. So the iar excita- | ex enii e threads which form the sucker by | that the reh species would ye al 
Fey of the Potato is not a producing cause of di , | which it exhausts the yo of the various vegetables upon | The Spruce Firspecies was named by Li 
but a of that its vital energy is which it is found. In the aphides we have still more | Pini Abietis; and De Geer d 
impai Now, ener knows that plants | curio mplicated changes ; the females at one Gallarum Abietis. De Geer’s 
in a weak condition become th of a whole e of the year producing eggs, an at another fully | one of j the > t interesting 
ho itie fungi, Ke. In fact a developed larvæ (one writer has, „ asserted that | “Memoires;” and from it we learn not only 
t ggle goes between preservation and he has seen them bring forth winged iduals), in question or — are prod 
destruction—life and death. The plant pu all | this, too, without the essity of impregnation by the | of the minute ! eggs of whieh 
j live ; th 
nec 
its to ese different agencies seem deter- male for the period of many successive generations. In 
mined to destroy it; and d y ey ly will, this ily, too, | we nb ange a omaly of the | at one se season of the year okies : 
unless some e eous comes to i p ; as it females produced at o m being quite unlike those | “ Ruricola ” on the h ; whilst at another they 
seems to be a law ading alike the vegetable | which are found 1 Aerian ; in other ete = they | closely resemble the winged male | by“ » they s9 
and animal kingdoms, that all diseased subjec ould | are winged and like their ‘partners at one seaso „they | on the Spruce, as arse it prbabletat™ Rs are me 
quickly perish, and not continue to cumber or the | remain nee. as regards their aerial * two insects belong to the sam: Dr. sA 
beauty of the It is obvio : the slightest organs at another. has also illustrated these i — bes his b e na 
change of the air, either in reference to heat or moisture, | The engravings in the prese! article afford an | Vol. III., and from his observ: we farther lear ün 
will often prove fatal to a weakly plant, whereas the | instance in which this modification is carried to its | the females have the power pry prodi eggs, and even 
or far grea hanges would not at affect | greatest extent ; indeed, so far, that the females found re ng young, before pai acquire their wings, Evidence 
injuri y the e plant in t mply proving t p ic A af th >, } g g f this arkable will be found i in our v 
> ge weakly plant furnishes a favourable medium for | to the family Coccidee, and those produced at another fig. e, saiok: from ratio k s plate: es, 
ap a of active ; while a healthy hideous. : 
with the means of resisting it. Hence These eet ea so interesting and anomalous, 
8 against the ravages of disease is a good | are acc companied also by effects upon the rs aora 
conto, or;as a physician woud say, bere g 18 economy of the trees on which the ee. are reared, 
eirculation.” erino t has | resulting in the production of an excrescence — 
the constitution of the Pota How i is it to shows us, to a certain . how, in PORE m. plants, 
be restored to its original vigour ? 2 cutting off a leaves are transformed = tals. 
sed parts, or diligently Wes and destroying ev Paper fi 4, p. 796, there appeared an 
little insect that has lived ested upon Potato Asien eren “Ruricola” on a disease of the Larch tree in the 
for years? No. But by going earnestly to, work, with the | sprin ing resembling American blight, ——— by small 
view of restoring the gene lth — sa tato. This measly one, 8 blackish anim: more or less 
effected not only by raising new varieties, but clo short white N= ny * ce, not larger 
at on securing the e soundest tubers, subjecting them . in’ 5 . “ith six very small legs, and a short 
to the rational systems of treatment ppa men ir in — Raith ‘rom which proceeds a 17 flexible 
your excellent Leader of the 4th og set the scales of the bud; and 
bringing them under a system strict r as to be observed a cluster 
* 
ag years we have been stimulating the Potato 
plant with rich dt. Si its whole structure 
crude sap tessa non and smothered 
elabora d thus throwing its 
ric dander, and ee me, 
It may 
improve its sani 
oe ie have loys observed, without any exception, 3 
richer the land and the better the crop the m 
tem 
ntry, s prac 
ay rags eren 
the stric sobrie ois 
eonduct he would alm 
the latter, escape. ſor 
I believe there is triking ana logy between the 
mal te g cause “of “cholera, so far a s known 
se. N of the Potato disease. Bo Pvp seem in 
to be atmospheric; that is, the bois 
i neral 
Sarem perish ; by 
So Sord or e. a am, 
t this — 
harmless 
deadly effects y.: 
both cases I beers be 8 defined in two words 
—dirt and debility 
a conclusion 4 may gr es Aaret = the exception | 
crops on poor soils, ston pario AM 
dere and 1 ee 
kni this year 
BEE 
the erops w. 
Fl, ‘Kirkleatham Tall, 
et ~ ENTOMOLOGY. 
oan a THE SPRUCE-GALL ADELGEs. 
Tur ordinary routine of bene ee insects — from | m 
an egg deposited Kaes a e 
* „or 
of re 
the 
k e. Ra the 3 a nu 
physi 
world. Jo entire parem of insects, 
a ari being subject as it were to an advance 
towards perfection n in their earlier states, the larvee differ- 
+ Heel 
wings, whilst the pupa state is active and the insect 
with rudimental Amongst 
of minute eggs, 30 or 40 in number, each attached by a 
“tr slender thread. The acco — wood-cut 
the kent itself m 
same time there were — — 
very 
mber of v minute six 
clothed with a white cotton 
4 = s z> they had spread over the ele of the Larch, 
n ny 
weaned to be 
icola 
nee, “í 
legged active larvee, which “ Ruricola” correctly regarded 
as the young hatched from some of the eggs. These Home Correspondence. 
are re on the leaves at fg. 55 5, and one of them Late Peas. ould not have t 
mag g. 6. Wh æ, however, had | further on this subject if th 
once selected a leaf, they Posed their rostrum and | great investigator of the laws o 
d tina ne beginning Knight, had 
arvee 
between the scales of ied buds, but also this 6 
insects, W 
Linnzeus Speer: were it not a vernac 
the . insect: that of Sacciphantes 
untenable, being — by that of Adelges, 
imposed by Vallot. J. O. W. 
pro 
spondent “ A., 3 
the Cele ach 
iod to Coccus, from which the female differed in not 
| being covered with a scale, and in the eggs being 
deposited not beneath ‘the mother but sg one side of ne 
in the young 
be | like its female 
h enjo 
joying 
instead of 5 — ae 
ing | Saren 
to form on, rece recei 
must become as 2 
and tlie eee — that the 225 
suce y brought to 
mga to 
ha 
and ge have Erer * 
hi 
wiht 
journey.. Its Iti isa t 
