202 



MICROSCOPIC OBJECTS. 



object placed on the stag-e t ; or if he does not hke that, 

 he may attach three bits of black lead to the bottom of 

 the said stag-e, and slide that about instead — I care not 

 which. As to the said stage, it is a very simple affair — 

 just a hoUow cylinder of wood or tin, with a flat bottom, 

 and a plane mirror in it moving in one direction and 

 turned round to the quarter the hght comes from. I 

 myself prefer the following arrangement, which dispenses 

 with the stage. Get a small table of appropriate height, 

 so that when the instrument is placed upon it the eye- 

 piece shall meet the eye comfortably ; the top of it is to 

 be made of slate with a hole in it about three inches in 

 diameter, to allow light to reach transparent objects 

 placed over it. Under this table there must be a shelf 

 or stage, on which you place a small dressing-glass, to 

 reflect hght upwards. Here is your apparatus complete. 

 By means of prisms you can observe looking either 

 horizontally or at an angle of 45°. What would you 

 more ? The whole concern will make a very good 

 ornament for a 'lady's boudoir. 



Fig. S. Fig. 6. Fig. 5. 



Some persons, however, are fantastical and fastidious, 

 don't hke prisms, and must have everything done in a 

 philosophical manner. To such I recommend the follow- 



