288 MEMORANDA. 
scale invariably held on the same level as the object when on 
the stage, but not always at the same distance from the eye, 
we should have some astonishing results; for instance, by 
doubling the length of the body the magnifying power 
would also apparently be doubled; but this we know to be 
impossible. 
As regards the illumination of the podura scale from above, 
when under an +th object-glass, I have had the pleasure of 
sending Mr. Lang a specimen suited for such examination, 
and he has told me since that he can confirm my representa- 
tions as to the appearances ; at the same time I must confess 
that I have not explicitly stated in my description the fact of 
having made allowance for the image being reversed by the 
microscope, and consequently Mr. Lang was perfectly justified 
in presuming that I had overlooked this essential point. 
Respecting the conclusions which I have ventured to draw 
from those appearances, which are now confirmed by another 
observer, I merely leave them for the further criticism of those 
who may be interested in the subject.—Ricuarp Beck, Lister 
Works, Upper Holloway. 
