NOTE. 
Organs of Vision. — Dr. Theodor Beer, whose valuable studies on 
the sensory organs of both vertebrates and invertebrates are well 
known, is engaged in writing a comprehensive work on the Compara- 
tive Anatomy and Physiology of the Organs of Vision, and to make 
this as complete as possible he is anxious to acquire separates of all 
articles — for which, if desired, he will send his own writings in 
exchange — dealing in any way whatever with the anatomy, embry- 
ology, zoólogy, pathology, or literature of the organ of sight in ani- 
mals or the eye of man, or with reactions to light. Dr. Beer is 
particularly desirous that none of the widely scattered writings of 
Americans should escape his attention and, therefore, especially 
invites the codperation of all Americans who can aid him. 
Communications should be addressed: 
Dr. THEODOR BEER, 
Privatdocent fiir vergl. Physiologie a. d. Universitat, 
ANASTASIUS GRUN-GASSE 62, WIEN, XVIII, AUSTRIA 
