254 
Monpay, Feb. 26, 1872. 
The PRESIDENT (PROFESSOR HuMpPHRY) in the Chair. 
Fellows elected : 
J. W. Hicks, B.A., Sidney Sussex College. 
K. H. More@an, M.A, Jesus College. 
Communications were made to the Society : 
(1) On Teichopsia, a form of transient ‘halfblindness ;’ 
its relation to nervous or sick headaches, with an 
explanation of the phenomena. By P. W. Laruam, 
M.D. 
The author said that the disturbance of vision referred to in 
this paper was a subject which had engaged the attention of Sir 
John Herschel, the Astronomer Royal, Dr Hubert Airy, and 
many members of the medical profession. He should proceed 
to shew that it was one stage of a complaint known under the 
name of nervous headache, bilious headache or sick headache ; 
the complaint not always accompanied by disturbed vision, but 
other disordered sensations being substituted for it, and on the 
other hand the disturbed vision not being always followed by 
headache ; and he should then endeavour to explain the phe- 
nomena. He divided the complaint into two stages, (i) the 
stage of disordered sensation, and (ii) the stage of headache. 
After quoting the descriptions given by those whose names are 
mentioned above as well as by persons who had come under 
his own observation, he referred to the causes and condi- 
tions under which the attacks were induced. It is to be ob- 
served, he said, that all these causes and causes like to them 
are of a depressing nature, exhausting the power, and therefore 
lowering the tone of the system, putting it out of tune, disturb- 
ing the harmony of the functions, and at the same time exalting 
