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  CATALOGUE No. 40.

  MICROSCOPES
  AND
  ACCESSORY APPARATUS.

  ERNST LEITZ
  WETZLAR
  GERMANY.

  Founded in 1850.

  Branch Offices:
  NEW-YORK:                CHICAGO:            BERLIN NW.
  411 West 59th Str.    32-38 Clark Str.    45 Luisenstrasse.
  30 East 18th Street.

  1903.

  ="Highest award"= Worlds Columbian Exhibition =Chicago 1893=.




  Contents.


  New constructions                            5
  Objectives and Eye-pieces                    7
  Stands                                      16
  Illuminating Apparatus                      20
  Complete Microscope Outfits                 24
  Microscopes for Mineralogical Research      57
  Dissecting Microscopes and Lupes            62
  Apparatus for Blood Examinations            70
  Micrometers                                 73
  Drawing Apparatus                           74
  Mechanical Stages                           78
  Photo-micrographic Apparatus                82
  Projection Apparatus (Edinger)              84
  The Large Projection Apparatus              87
  Microtomes                                  92
  Miscellaneous Accessories                   99
  Publications                               104
  Index                                      105




  Notice.


All previous editions of this catalogue are superceded by the present
one, which should be exclusively used in ordering.

Orders will be filled at once after their receipt.

In ordering care should be taken to give the =number= of each article
desired and to state listprice.

To avoid delay and misunderstandings, we request that name and address
be plainly written.

Goods are forwarded at the expense and risk of the purchaser.

Our instruments for use in =Universities, Colleges, Schools= &c. of the
=United States= are by law free of duty and we shall be pleased to make
specially low quotations for such orders.

  ERNST LEITZ.




  New Constructions.


Since issueing our last catalogue, a number of new apparatus and
accessories have been added. The following are the more important ones:

1. A completely =new stand "A"= with extra fine micrometerscrew
transmitting its movement directly to the tube. The stand is of elegant
appearance and large dimensions, making it especially well adapted for
work in photo-micrography.

2. =Stand I= is now fitted out with the new special fine adjustment (each
division {1/1000} mm).

3. =Stand II= with round centering stage.

4. =Stand IV= is replaced by a model of larger size.

5. =Photo-micrographic apparatus= for use in horizontal and vertical
position, having joint for inclination, large size bellows and
plateholder.

6. =Large projection-apparatus= for electric lamp of 30 Ampere with triple
collecting lens of 210 mm aperture.

7. =Objective 1 a= with adjustable mounting and changeable magnification.
It is an excellent objective of low power for general purposes, having a
comparatively short working distance.

8. =Objective 1 b= with changeable magnification of lowest power, as far
down as two diameters. It serves for drawing extended sections and
specimens.

9. =Saccharimeter after Mitcherlich= improved form.

10. =Trichinoscope=, projection-apparatus of strong and simple
construction.




  =Preface.=


Our American Branch house in New-York under the management of Mr. Wm.
Krafft has now been established for over 10 years. This period has
witnessed a gradual development of our business in the United States,
making it necessary to establish some years ago a Western Branch in
Chicago of which Mr. R. Gibson has charge.

The cordial reception our firm received has been most gratifying and we
take this opportunity to thank our many patrons for their kind
consideration.

It is our aim to co-operate with the scientists and construct new
apparatus to meet their needs or improve others wherever this is
possible.

The foregoing list of additions and improvements made since issueing our
last catalogue is proof that we spare no time nor labor to hold pace
with the increased wants of modern times.

We have now manufactured and sold over 71000 compound microscopes and
31000 oil immersion objectives, a large number of which are used in the
laboratories of Universities, Colleges, and other Educational
Institutions of the United States.

We are prepared at New-York and Chicago to repair our instruments or
make alterations at short notice and at lowest prices. The optical part
of a microscope should invariably be sent to the maker, as he is best in
a position to repair same and has an added interest to bring a lens back
to its original quality or even improve it.

Microscopes, bacteriological apparatus and all other scientific
instruments or preparations expressly imported for