386 Prof. O. N. Rood on the Circulation in the Eye. 
of the microscope as well as after active exercise, or any other 
stimulus to the circulation, I am abie to reproduce it easily and 
with great clearness. 
‘When in these conditions I look intently with the naked eye 
upon a bright surface as that of a white cloud or a sheet of letter 
paper in the sunlight, the first appearance presented is that of 
numerous bright points darting around in various broken curves, 
coming in view and disappearing fitfully, but in such positions as 
to indicate the recurrence of the same motions, or the passage 0 
successive particles in certain prescribed and permanent chan- 
usually with less distinctness than when first seen. 
believe I could at any time ‘bring into view t 
of the circulation by continuing the experiment for a minute oF 
two. With the lens of m ket microscope held at about the 
focal distance I scarcely ever fail to obtain this effect in a few 
seconds, 
“ Your experiment with the blue glass is very interesting and 
succeeds with me perfectly. It will be a great gain if with 
comparatively little discomfort and without risk we shall be 4 
to scrutinize steadily this intraocular phenomenon.” 
