Super-Newbie question - Box selection...?

I’m trying the Gingerbread Man tutorial and the “box selection” isn’t picking up the vertices in back. Only the visible vertices are selected. If I move those so that the second row is visible and box-select again, then the first two rows are selected, but not the third (I’m using the subdivided-cube object, here).

Is there something in the manual that I missed?

For full infrmations’ sake, I’m running Blender 2.37a, under Mac OS 10.4.3, using a Wacom Intuos 2 tablet w/ 3-button mouse.