14 Smith,, on a Dissecting Microscope. 
requisite^ be cleaned with a syringe^ and after the plug was 
replaced^ the trough conld again be filled with clean water^ 
and the dissection proceeded with. It will be apparent from 
the drawing that this trough can be easily removed when 
requisite. 
Note. — It having been suggested to me at the close of the meeting that 
a more portable form of the microscope might be found convenient, I have 
endeavoured, as shown in the following drawings, to carry this out. 
Nos. 4 and 5. 
No. 4 showing the instrument when closed, and No. 5 as it appears when 
opened out for use ; and as the general plan of this is precisely the same as 
the one previously described, it will be only necessary for me to say that I 
propose to make the supporting pillars work with hinges, which are pre- 
vented by a catch from going out of the perpendicular ; these pillars (which, 
in this case, are joined together at sides by two cross bars for the purpose 
of giving them greater firmness) are made to fit into four corresponding 
sockets in the stage, which is now separate from the lower portion of the 
microscope. Any further detail will, I think, be unnecessary, as I have only 
attempted to indicate how the reduction in size might be effected without 
interfering with the distinctive features of my original plan. 
