Errata. 
\ 
age 250, for 1862 read 1812. _ 
e 254, line 1, for Tabot read Talbot. 
line 21, omit Iacock Church. 
line 22, for Vienna read Vienne. 
line 23, to Calotypes add Photogenic Drawings and Photoglyphic 
Engravings. 
line 4, for positive read positively. 
