Must the albumen be poured off from the plate after it is spread over the
surface, in the same manner as collodion?
Is the plate (while roasting, according to the process of Messrs. Thompson
and Ross) nearly perpendicular in the process?
Will the iodized albumen, for giving the film, keep; and how long?
How long will the plate retain its sensitiveness after exciting?
May the same sensitive bath be used for a number of plates without
renewing, in the same way as silver bath for collodion?
In conclusion, what is the average time with single achromatic lens, six or
seven inch focus, to allow to get a good picture?
Will photographers who are chemists turn their attention to obtain
sensitive dry glass plates? for I think there can scarcely be any doubt of
the advantage of glass over paper for _small_ pictures (weight, expense,
&c., are perhaps drawbacks for pictures larger than 5 × 4 inches); but the
desideratum is a sensitiveness nearly equal to collodion, and a plate that
can be used dry.