The New York herald., 1851-08-22

"Chloriten Of Unonvlle Pa, with the results of Bov
pipe examination; By William p. Blake, Yale Analyt
10. An account Of the Mssrschaum Formation in As
Minor; by Professor J. Lawrence Smith, Of the Unve
sity Of Louisiana
| H. Notices Of q Magnetism Opal by the same
~ Upon the Metamorphic Condition Of Frankliait
(N J); byA. G. Harrington, Esq Of New Jersey.
| POINTS ECONOMY cIcADA sEPTEMpEcDf (sy
vESTEES YEAR LocUsr) BEARING UPON THE PLURAL oRI
| LOCAL CREATION OF THE SPECIES, DIR
| W. l. BURNETT OF BOSTON.
The investigate the essential structures OF ami
mails, and the more extensive our knowledge Of thei
habits and conditions Of being the more does be
impressed with the close relations existing between
them and their outward conditions Of life Our faith in
agencies Of the world is essened while belief that
the unison Of their lives with those agencies not with
them matter OF experience Is strengthened careful
analysis OF these conditions has led believe
special creation OF the separate nas in the localities
IN which they are found In comprehensive article
published some time since Prof Agassz traced the
various phases under which this question may be con
dired and In may be found excellent for the
particular creation OF such tna and its immutabty
through any period Of time A question allied to this
but based upon different, and perhaps more enlarged
view OF life is the one OF the primitive numbers
species In this call to aid embryology AMI It's
allied branches but the influences which civilization
has wrought both directly and indirectly upon the ratio
mortality of animal life affect much the validity Of our
conclusions Nevertheless the general tenor Of all such
inquiries is to show that the number Of each species
have been pretty that which find in It's ma
tura and undisturbed state instead Of single pair
otherwise viewed In locality the natural relations
agencies mau have right to infer that the exist
ing of destructive elements Of life is fair express
sion of the past and also that the rate of the
mortality OF species is that which it has been sub
jected during past times 49,
conceive, that cannot infer this, when have
evidence Of any changes in the general economy of
Nature at that locality, cannot infer anything OF the
geological condition Of the past Besides the c0mpara-
lively limited term of human experience ustifes such
view which has also still more worthy ground Of sup
port in the comparison of the animals fecuudty with its
natural liabilities of mortality. IT, in a term Of human
experience of hundred thousand years, the
tural procty Of well known species only keeps
with its relative mortality that the number of that spe
cies at the end of that time about the is very
difficult to comprehend how with species Of limited
numbers that the power of procity could ena.e
single pair to reach the present numbers under
istng climate of the earth.
Werelit so we should expect to find very correct
ratio subsisng between the present numbers Of any
disturbed species and its Of reproduction But
since attention has been called to the subject and with
Of the lower animals the counted not only
there no reason for supposns that such relation is
fact OF the truth Of which have lately been the more
and more convinced from counting the ova of many
insects and comparing the result with their we'll known
habits and conditions Of life.
The value, however. Of snch geological phenomena,
bearing they do against the ordinary opinions
primitive condition Of animal life strike different minds
with different force according to the strength the tenure
Of these preconctived views may have their minds
There are examples in which there appears escape
from conclusions Of this character And although 1
\
mails, yet from its well marked character and recent
currences select that furnished in the Seventeen years
Locust as the subject of this paper.
The present year Qs5I may be noted containing
episode Of insect life Of than ordinary int
and value for in has occurred the grand appearance Of
the locut The geological value of such deem
very great and especially because since their
last appearance, many changes in our views of animal
life have taken place.
The regularity promptness with whch this insect ap
pears the end Of interval of II well known
thac 1stto Of ifs he aOu
ing the las two three times Of its appearance, its
habits and peculartes Of life we're quite thoroughly in
vestigated need not therefore, alude to them, ex
cept 30 far as they touch our subject.
During the last Of Nay had the good fortune to wit
ness their grand sppesance in the Inferior OF psnsyya
BILE numbers, and . fine opportunity wa given me to
learn something about their conditions Of life The in
sect appears In Its perfect or image condition simply for
the preservation Of species its period of life in this
state Is therefore quite brief Both male and female
about their functions On sG:p,ns rne esr.h
most entirely subterranean and considering the depth
to which they descend almost as isolated from the agen
ces Of civilization those Of the tenants Of the ocean
II sppearedlevident, frtm what saw OF their move
mens, that unless swept away BY violent currents they
the comefs Of this year may properly be said to be the
linear descendants which there appeared nfy
more years ssee This his, Is ss 70 q our
strict inquiries Of several men who had witness
this their fourth appearance through the same tract
Of country and their replies always were that they did
not think numbers vary materially either way Be-
icg NJ Sans. farners 4 Thought them
;s - az .r.,,.r s;,cs ,hsv rsg.7d The r.v.css ~
SS,. "a liz no .numon eve We will NOV ,ook little
sn. s .sS,. 80 rn.odnction "
y" rs Po~ers u pa. zoo r,s h;ch fror, c.r.ai, re
Inc mnie ~ s' n,hT ~ har. rad. on, n,;.ro
st,ons y, Va. ,h ~. ". ~ na.r,v ali S~cunSs,ed vs.
have then for every two individuals which have ap-
peared this year depositp SOC emoryos Tor the gene
W. - hss nst b~sn st.ted about the upifor.
;,y ~ their number. each time II appears that from
the liabilities Of destruction during the long term Of
s.v. nt..r rs.rs ont of these nve hundred embryoe
81, o sr..y certain OF life and Appearance In their
oryct .tsfs thst s inst replacine the two parents
r.. ch.r, s of life the erefore with this insect are
.a,,rS nrmt.,s tvo an Ave hundred This calculation
- to some hut N Ne r, fleet Il can scarce
!. y o,h.,w,s. ~ supnose the chances we're double
Ht q sor IN Svs hundred then We shoud have at each
IT, i,,s. anh,. ~. nnmhers OF their last time VII,
enss,ys,,or hss .hovr 10 he untrue .nd vhch would
"a o.. a.. f,,,r. cor.,,t,o, 20 ~. ,.,s..hl.
ssss s,a !. a. ,o.si,,,ss ~ ,hsir snnssr.ncs
pSn ~ ,hs, chsnces vsrr thre~ 70 Ave hpndrsd or
ths orig,psi stock would ouickly