Dr. Cullen’s plan for crossing the Isth-mus of Panama by a Ship Canal has re-ceived the emphatic testimony in its favour ofthe veteran Alexander Von Humboldt.—“After having,” he says, “labored, in vain,during half a century, to prove the possibilityof an Oceanic Canal, and to point out theGulf of San Miguel and Cupica as the pointmost worthy of attention,—after having re-gretted, almost with bitterness, in the lastedition of my ‘Aspects of Nature,’ that theemployment of the means which the pres-ent state of our knowledge affords for obtain-ing precise measurements has been so longdelayed,—I ought more than any one else,to be satisfied to see, at last, my hopes for sonoble an enterprise revived. * * Theundertaking is by no means above the intel-lectual and material power which civilizednations have attained to. The work shouldbe one to last forever. It should not com-mence with a canal with locks, like the mag-nificent Caledonian Canal; it must be a real-ly Oceanic Canal, without locks—a free pas-sage from sea to sea, across which the speedof the navigation will be modified, but notinterrupted by the difference in hight andnon-coincidence of the tides.”