Entered, according to Act of Congress, in the year 1858, by
S.  D.  HUMPHREY, In the Clerk's Office of the District Court
of the Southern District of New York.


To J.  GURNEY, WHOSE PROFESSIONAL SKILL, SCIENTIFIC ACCURACY,
AND ENERGETIC PERSEVERANCE, HAVE WON FOR HIM UNIVERSAL ESTEEM,
THIS WORK IS MOST RESPECTFULLY INSCRIBED.



PREFACE. 

There is not an Amateur or practical Daguerreotypist, who has
not felt the want of a manual--Hand Book, giving concise
and reliable information for the processes, and preparations
of the Agents employed in his practice.