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NOTES AND MEMORANDA. 



Death of Herr Max Schultze. — We very much regret to say that 

 Herr Max Schultze, the distinguished German anatomist and his- 

 tologist, is dead. He was the editor of the well-known ' Archiv fiir 

 Microscopiche Anatomic,' devoted largely to the anatomy of the 

 tissues and to the infusoria. He wrote alsa on the embryology and 

 anatomy of the worms, of echinoderms and hydroid medusse, and on 

 the foraminifera ; and ho was noted among human anatomists more 

 especially for his several splendid essays, some of which have been 

 translated into English, upon the Histology of the Retina. He was 

 born in 1825, and died, in the prime of life, at Bonn, having just had 

 completed for his use, as is said, the amplest and most elegantly 

 constructed laboratory in Europe. 



A New Form of Achromatic Condenser. — This form is constructed 

 to supply the place of a compound sub-stage, together with all ordinary 

 sub-stage apparatus. The optical combination (see figure) A is so con- 

 trived that it can be used 

 as a very effective spot lens 

 from the 3-inch objective 

 up to the -pjths, and having 

 an angle of aj)erture of 140^ 

 enables it to be worked 

 with a J^'i"^^^ objective, 

 giving a well-defined image 

 of the object under exami- 

 nation without blur or mist. 

 B is a small lever by which 

 the contracting diaphragm 

 is opened and shut ; C, C, 

 two small milled heads by 

 which means the optical 

 combination A is centred to 

 the axis of the objective. 

 The revolving diaphragm E 

 has four apertures for the 

 purpose of receiving central 

 stops, oblique light disks, 



and selenite films, as shown in the engraving. D is a frame carrying 

 two revolving cells, into one of which a mica film is placed which can 

 be revolved with ease over either of the selenites below, whereby all 

 the changes of tint and coloui- can be obtained that are required in mani- 

 pulating with polarized light. The darts and P, A shown on the engrav- 

 ing indicate the position of the positive axis of the mica and selenite 

 films, by which means former results can always be recorded. The other 

 cell is of service for receiving oblique light stops, &c. Either of the 

 two revolving cells can be thrown into the centre of the condenser and 

 stopped in their proper position by means of a spring catch : when thus 



