You'll find it perched on yonder tree

Puzzle

My first mounts high when low you sleep;
My second's found within the deep;
And should you wish my whole to see,
You'll find it perched on yonder tree.

Hint

Answer

References

• Loyd, Sam [1914]. in Loyd, Sam, Jr.: Sam Loyd's Cyclopedia of 5000 Puzzles Tricks and Conundrums (in English). New York: Lamb Publishing company, page 56.