ZOOLOGY AND BOTANY^ MICROSCOPY, ETC. 
99 
Moseley’s Object-box. — This (fig. 14) is a new form of object-box 
invented and provisionally protected by Mr. E. Moseley. 
The special feature of the box (which was exhibited at the November 
meeting by Messrs. W. Watson and Sons) is that, by drawing forward 
the bottom tray all the others follow in series, displaying the labels of 
the slides. In the old form of object-box each tray has to be removed 
to pick out any object, but in Mr. Moseley’s the object can be at once 
seen without any trouble. The box occupies no more space than the old 
form. 
Maddox’s Simple Substage Condenser.*— Dr. E. L. Maddox writes : 
— “On the supposition that the following remarks may be of interest, 
I beg to offer them to your notice. They are founded on the application 
of a rather novel kind of substage condenser for the Microscope, which 
has furnished me with some rather unexpected results, both visually and 
photographically. Whatever may be its real value, it has one claim 
which cannot be questioned, and that is its cost can be placed at zero. 
No doubt many of your readers have perused Professor Lowne’s interest- 
ing article on “ Interference Phenomena in Eolation to True and False 
Images in Microscopy,” reported in the Journal of the Quekett Micro- 
scoj)ical Club for April of this year. Prof. Lowne suggests also a new 
theory for the formation of the diatom-image when it is brighter than 
the field, and that ‘ the cause of the positive image is that tbe diatom 
is illuminated from above, not from below. It is illuminated by reflected 
light from the upper surface of the front lens of the objective ’ ; and the 
Professor cites an experiment showing the ‘ great illuminating power of 
the back of the front lens of an objective.’ This surface of emergence 
of the front lens is a concave mirror, which condenses the reflected 
pencil upon the object. That such is the case to a certain extent is 
correct ; but the following experiment will, I think, show it does not 
entirely suffice to form a bright image of the object in the case of 
diatoms. Having suggested to an eminent microscopist and photo- 
micrographer the use of a cylindrical lens of short focus for a certain 
Fig. It. 
* Blit. Jourii. of Photograpliy, xxxvi. (1889) pp. 812-3. 
