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that a strong force is required to separate
them. This perfection of surface with the
cement generally used to secure the adhesion
of glass surfaces would insure the solidity of
the mass. It is hardly possible that M. [Teil?]
could have failed to secure perfect bars of
glass, out of the large quantity made during
his 19 unsuccessful experiments, to have
made a dozen lenses of even larger size
than he desired. It seems evident that
much larger and more perfect lenses can be
constructed by this new method than by
any other. The misfortune is that
those who have the time and inclination to
investigate such subjects never have the
pecuniary ability to practically demonstrate