ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



549 



the specimen is not raised or lowered in adjusting. For the con- 

 venience of using the knife sc[uare, or at a right angle to the direction 

 of motion of the knife- carrier, and also for cutting sections in ribbons, 



Fig. 131. 



the holder is reversible, in which position the specimen is in about 

 the centre of the slide. There is also the German freezing attachment, 

 with atomizer. 



The base and upright are of japanned iron, the other parts of 

 brass, nickel plated. The case is so made that it is not necessary to 

 remove the instrument when operating, as it unfolds, and will lie flat 

 on the table. 



Cambridg'e Rocking Microtome. — The Cambridge Scientific 

 Instrument Company have just introduced an improved and greatly 

 simplified microtome for producing ribbons of sections imbedded in 

 paraffin (fig. 132). 



The principle of the simplification is in the employment of a 

 rotary instead of a sliding movement of the parts. The continuous 

 moving silk band which is used in all previous forms is entirely done 

 away with, and the ribbon of sections falls by its own weight direct 

 from the razor on to a sheet of paper or on to the glass slide on 

 which the sections are to be finally mounted. 



The construction of the instrument is as follows : — Two uprights 

 are cast on the base-plate, and are provided with slots at the top into 

 which the razor is placed and clamped by two screws with milled 



