602 
Transactions of the Society. 
at the time of the introduction of the Oherhaeuser stand ; it is 
that made by Chevalier for Dujardin, and with which he worked, the 
drawing being taken from the article already cited. Like others of 
the period, it is fixed for use by screwing into the lid of its cabinet, 
and the focusing is effected by movement of the stage. In the 
present specimen the compound body can be lifted off the pillar, to be 
replaced by the arm carrying a simple lens shown in the margin, and 
by means of a hinge and the interposition of a right-angled prism 
above the objective, it can be used in the horizontal position. It is, 
in fact, a simplified form of the “ Microscope Universel” of Chevalier. 
Stands of similar form were made by Plossl and others at the time, 
and were equally superseded by the new pattern. 
Fig. 93. 
Fig. 94. 
TT 33 
[In the original paper, as read, some comparisons followed between 
the Continental and English forms of stand, which unfortunately were 
taken as representing me as the advocate of the former exclusively. 
This was not my intention, and with the approval of Professor Bell, 
I omit these remarks. With the various observations of the speakers 
in the discussion I entirely agreed. 
This matter suggested itself to me originally in the form of two 
questions to which I found no answer ready : First, why is the tube- 
length of the Continental stand 150-160 mm. ; why should objec- 
tives be corrected for this length and no other; and who first 
decided upon it ? Secondly, why is the Continental Microscope-stand 
in its complete form provided with a rotating stage of peculiar pattern, 
the significance of which is not at once apparent ? I investigated the 
matter historically, with the result presented in the text.] 
