Where will you find the poem in which Ogden Nash rhymes mortgage with dowgage?

The poem you're looking for is called "The Turtle". It's a hilarious and slightly absurd poem by Ogden Nash, known for its playful rhymes and witty observations.

Here's the relevant stanza:

> He travels slowly, and he travels far,

> He travels slowly, but he goes quite a distance,

> He's got a shell, and he's got a scar,

> And he's got a mortgage, and he's got a dowage.

This poem isn't often anthologized, but you can find it online and in some collections of Ogden Nash's work.