  We extend Lax-Phillips' theorem on discreteness of pseudo-cuspforms, in the
style of Colin de Verdi{\`e}re's use of the Friedrichs self-adjoint extension
of a restriction of the Laplace-Beltrami operator, as opposed to the use of
semigroup methods. We use this to prove meromorphic continuation of Eisenstein
series in several $\mathbb{Q}$-rank one cases, again following Colin de
Verdi{\`e}re, as opposed to the semigroup-oriented viewpoint of Lax-Phillips
and W. Mueller.
