220 



The Microscope. 



tion plate. — Apparatus for warming the object under the micro- 

 scope. — Various apparatus not mentioned. 



Class V. — Apparatus for measuring. For the eye-piece, for the 

 stage, for the cover glass. 



Class VI. — Micrometers. Hand and mechanical micrometers. 

 — Apparatus for ruling micrometers and Nobert's lines. 



Class VII. — Apparatus and accessories for microscopical preparations 

 and dissections. Simple microscopes, doublets, magnifying glasses. 



Class VIII. — Microscopical preparations. Preparations of all 

 kinds. Simple and systematic preparations. Type plates and 

 test plates. 



Class IX. — Apparatus for bacteriology. Culture ovens ; ovens 

 with low and constant temperature ; ovens for sterilising by dry 

 air and by vapour. — Apparatus for the coagulation of blood, — 

 Apparatus for the sterilisation of serum. — Boxes for disinfecting 

 instruments and for sterilising gelatine plates. — Regulators of gas 

 pressure. — Inextinguishable lamps and lamps that automatically 

 lock when the flame is extinguished. — Apparatus for the seeking 

 of microbes in the air and water.— yGlass ware for bacteriology 

 (flasks, tubes, blocks, plates, warm water funnels, hooks, etc.). 



Clas>< X. — Works on the microscope. Treatises on microscopy. 

 Works treating of all the applications of the microscope. 



V«/AYS 



AND •^AEANS 



A FISH TR0UC4H. — An objcct which always interests the micros- 

 <;opist, and excites the wonder and admiration oi those who re- 

 gard things microscopic from the point of popular interest, is the 

 circulating blood in living creatures. Nothing in this line has 

 proved more satisfactory than the microscopic view of the circu- 

 lation in the tail of the gold fish. Thanks to Mr.Kent's inven- 

 tion of the fish trough, 

 the arrangement of 

 the fish for this pur- 

 pose has been rendered 

 comparatively simple 

 and easy. 



