Performing a feat which requires

The joint skill of Blondin and Cerito?

Ah, Jumbo! stretch balance-wise tail-whisp and trunk,

For you'll never get through if you fumble or funk.

Scarce "light" is his ponderous form,

And his footing is hardly "fantastic."

It makes one grow nervous and warm

To watch this colossus gymnastic.

Can't "trip it,"—although he may trip,—

His tentative toes throb and tremble;