ERRATA.

Prefaces, page vi., line 22	Insert “a” into “admitted.”
Prefaces, page x., line 13	Insert “the” before “assistance.”
Prefaces, page xii.	Insert “for” at commencement of line 24.
Page 33, line 13	For “Rabbit” read “Kitten.”
Page 486, 4th line from bottom	Strike out “The late.”
Page 511, two lines from bottom	For “Plate XIII.” read “Plate XVI.”
Page 584, 5th line from bottom	Insert “Stalk-Eyed” before “crustaceans.”
Page 624, line 12	For “or” read “and.”
Page 633, Plate VII.	Numbering of figures— For “152” read “158.” For “152a” read “152.”

(Professor Abbe, erroneously referred to more than once as “the late” is, the author is happy to say, in excellent health).

THE MICROSCOPE.