1897] MICROSCOPICAL JOURNAL. 219 



scopical supplies. In Europe, Watson, of London, Leitz 

 of Wetzlar, and Zeiss of Jena stand about equal as 

 to their merits but the Zeiss instruments are higher 

 priced. 



The Leitz instrument, best adapted for the use of the 

 pharmacist is the new stand TIC, with the following 

 accessories : eye-pieces II and IV, objectives 3 and 7, 

 double nose-piece, Abbe condenser and iris diaphragm. 

 It is fitted with a graduated draw-tube, plane and con- 

 cave mirror, and adjustable substage. The price of a 

 good instrument with accessories is about $60.00. 



Another indispensable accessory is an eye'2:)iece micro- 

 meter, to be used in making measurements of tissues 

 and tissue elements. This consists of a circular piece of 

 glass set in a hard rubber ring. On it is a scale of 5 

 mm. ruled into 100 parts. 



The following are more or less indispensible : 1. A 

 good sharp razor for making hand sections. 2. A stage 

 micrometer. This consists of a glass slide on which is a 

 scale of 1 mm., ruled into 100 parts. This is required 

 to determine the scale of measurement for the eye-piece 

 tnicroineter. After the scale is determined no further 

 use is had for this micrometer so one might be hired or 

 borrowed. 3. A half dozen or more watch crystals. 4. 

 Glass slides, with ground edges, and cover glasses. Two 

 or three dozen of each will be enough for most purposes. 



Other appliances, such as disecting needles, section- 

 lifters, pincers, compressors, etc., are convenient but not 

 absolutely necessary. 



For the mechanism, care and use of the microscope, see 

 these details given in text-books, of which the following 

 are recommended: 1. Rusly tt Jelliffe's Essentials of 

 Vegetable Pharmacognosy. 2. E. S. Bastin, Labora- 

 tory Exercises in Botany. 



Part two of both these books treats of microscopical 

 methods and vegetable histology ; part one, of the gross 



