ZOOLOGY AND BOTANY, MICROSCOPY. ETC. 



599 



can, by means of a simple and ingenious arrangement, be rotated through 

 180°, so that a kind of perpetual motion results. 



The microtome is made of cast iron of suitable strength and stability, 

 and the knife-slide has a working distance of 28 cm. The knife-slide, 







2 s 2 



