THE METHODS OF MOUNTING MICROBES 97 



whole tenth of an inch, 10 /-t. If this scale be care- 

 fully copied on a piece of thin cardboard or other 

 suitable substance, the dimensions of any microbe, 

 etc., drawn by the camera lucida or otherwise on the 

 paper in that position of the instrument, can be 

 easily read off in /*s. With the aid of a deeper eye- 

 piece or higher objective we can magnify the image 

 508 times, and then each small division of the scale 

 will represent 1 



