The New York herald. [volume] (New York [N.Y.]) 1840-1920, 1863-09-19

The moment is at hand when We shall Dc
ready 10 throw down our glove 10 every 'o'''En
invader of this continent; for lie uaiiy OF
Auerica. like the combined strengths oil It's lakes
and rivers must be one and indiyisible forever.
Nor is the great republic OF North America
alone in the desire to maintain TINS
unity The smaller States Of South
America are periodically NOV ing in the same
direction, aud we may confidently hope to see
a combination of all these Spanish-Amercan
republics. which will materially aid us ia our
determination to maintain and Insist upon The
Monroe doctrine in sll its integrity.
The proper duty Of the Emperor Of the
French, If he consult the happiness Of his peo-
ole. is to retire at once from the greatest diff
tuHy that ever threatened his dynasty. His
Cousin, the Prince Napoleon, sees the dangers
ahead, and il would be well for tho Emperor
himself IL he also could be made to see them.
III not, he will assured,y be the sufferer. AS
Cor the Prince Macmillan, who, it is said, in
tends to accept the throne II the action of the
Assembly of Notables be confirmed by the peo-
pie, il is easy to see that the vote Of "the
people," so called, will undoubtedly be ia
vorable to him. But 1t will not be SO easy to
convince the American people that these votes,
forced from the Mexicans by the superior power
Of arms can be anything more than compul-
cory acquiescence in that which they have not
She necessary elements Of strength to repulse.
Our rebellion, however, is now near its CLOSE;
and then it will be our duty not only to pre-
serve every inch Of Mexican territory to that
neIghboring and friendly republic, but to expel
from the continent OF America every European
invader who may dare to pollute its soil.
MODERN ENrERPRBE.-The axiom that ''there
IL nothing new under the SUM-" though correct
enough In regard to tho originator of ideas,
has but little application to their Development.
There are but few Of tho great modern dis
coveries Of which the germs were not known at
some early period of time. In the extension and
combination OF the crude conceptions of others
lies the merit of modern inventors But the merit
ia little If at all superior to that of the mind
with which they originated. He that converts
60 profitable results what otherwise must have
iain fallow is surely as much entitled to our
admiration aud gratitude ~ the man who
things away with spendthrift recklessness the
offspring Of his brain.
In the completion Of imperfect theories and
in She advancement Of art and science generally
it must be admitted that the last half century ex
hbits greater progress than any corresponding
period in the worlds history. And within that
limited period of time itself how much have we
improved on our own efforts. When our first
railroad was built some thirty years ago, an
extent OF fifty miles was considered \ gigantic
enterprise. Now, not only is every State Of the
tion intersccted by network Of these lines,
bit we are about to span the continent with
Que great road, extending nearly three
thnasand miles in length. How CON-
pa.ativeiy few years is it since Pro-
ir sor Morse was dnnning government for
"A small grant to enable him to demonstrate the
SUCCESS Of his discoveries in electro-magnetism
AN applied to the telegraph. Now, through the
medium Of these inventions, large portion Of
the busipess of the world is transacted, and
soon the two continents will be placed by them
ia hourly communication. Many Of US remem.
Der when the first vessel Of Collins line of fast
sailing packets elected our admiration and
wonder, and when some gave expression TO the
lear that q vessel which would only make .
foir sized jollyboat for the Great Eastern
woald be "hQgged" by her extreme length.
What revolution has taken place in our ideas
in this regard We now build steamers which
are equal to small towns in their capacity Of
accommodation, and which traverse the ocean
without the remotest apprehensions Of 50 IN
puctical disaster. And as to those boosted
works Of the ancients which obtained for the
period when they we're built the title Of the
Cyclopean age, what are they compared to the
enterprises of our own time The generation
that eau undertake TO tunnel the Alps and
Lake Superior, build the Suez Canal and bring
to principal cities Of the four great divisions
ot the earth into daily Geographic intercourse
with each other has surely made some steps
in advance Of them. Nor is it in works OF con-
strllcton alone that we exhibit our superiority
over the generations that have preceded ms. In
tue art OF war we have made strides so destruc-
tive that they will in time render war impos-
sible. When the rebellion broke out Admiral
Dahlgren declared that il would be out Of the
power OF any gun then in existence to throw an
elective shot from Fort Sumter into Charleston.
cur Parrot guns can now cast . shell more
than i've miles, and new discovery is an
nounced by which, by very simple arrange
,nen, OF the charge, . ball can be despatched
Al additional four miles, or farther, actually,
thar an object can be seen at sea. When we
have realized the Irish sportsmaus dream Of a
sun that can shoot round corner we shall
have bat little to improve upon in the engine
~ Of war.
This is truly great age, and We are great
people. Could we but find some means Of
,ueting the niger, we don't know that we have
anything more 10 wish for.
RgcoSsTRucrroS IN THE SoUrH.--It requires
no stretch Of imagination to see that the signs