**
^ .
v
3 a
\S>
Diagrara 1
in
tft-
Invisible Worlds.
The Relative Permanency of the Visible and
5?
(Illustrated by comparison with a stereopticon.)
**
^ .
v
3 a
\S>
Diagrara 1
in
tft-
Invisible Worlds.
The Relative Permanency of the Visible and
5?
(Illustrated by comparison with a stereopticon.)