Preface. 



The present volume constitutes the 32 nd edition of our Catalogue of Mi- 

 croscopes and Microscopic Accessories and differs in many respects from its 

 predecessor - - the 3l5t edition published in 1898. 



In the case of Achromatic Objectives E and F and the Homogeneous- 

 immersion Objective ^ we have raised the guaranteed minimum value of their 

 numerical apertures from 0.85 and 1.25 to 0.90 and 1.30 respectively. The 

 benefit of this improvement has, as a matter of fact, already been the property 

 of all objectives supplied by us these last few years. 



With regard to new constructions, or to improvements for the first time 

 mentioned in this catalogue, we would specially refer to the following items, viz: 

 Large Mechanical Stage, No. 44, p. 38; Attachable Mechanical Stage, No. 47, 

 pp. 39 and 41; new form of Micrometer Movement designed by Mr. 

 MAX BERGER, pp. 43 45; Stand for Photo-micrography and Projection 

 (Stand l c ), pp. 54 56; Stand for the examination of Brain Sections 

 (Stand l d ), pp. 56 and 57; Stand Vl b , pp. 64 and 65; small Mineralogical 

 Stand (Stand IX b ), pp. 69 and 71; Binocular Stands, pp. 72 77; new 

 Drawing Apparatus for low magnifications (Dissecting Stand P II), 

 pp. 7981; GILTSCH'S Drawing Stand, p. 91; MALTWOOD'S Finder, 

 p. 114; BORN and PETER'S Orientation Plate, p. 114. 



The text of the catalogue has also undergone considerable changes in the 

 order of its arrangement and the treatment of the subject matter. We have 

 endeavoured withal to group the descriptions of the various appliances in a 

 systematically arranged general division, so as to give this part of the catalogue 

 the character of a comprehensive guide rather than that of a price list. 



This modification necessitated the addition of a separate list of prices, to 

 contain merely the descriptive designations of articles together with their prices 

 and serial catalogue numbers and the code- words to be used in telegraphic 

 orders. 



Any one who is thoroughly conversant with the construction and uses of 

 the microscope and its accessories will find this list of prices more convenient 

 for reference than the catalogue in its former shape, especially since references 

 to the detailed descriptions and illustrations in the general part appear in 

 parallel columns to those containing the serial numbers. 



