MICROTOMES. 



361 



The precision microtome (Fig. 217) consists, first, of an upper square form 

 upon which the knife may be clamped in any desired position ; second, of two 

 horizontal ways upon which moves the carriage which bears the object-holder; 

 and, third, of a micrometer screw with an automatic feeding contrivance on the 

 under side of the movable carriage. The construction is very solid and great 

 rigidity of the parts is secured. The microtome may be used for either paraffin 

 or celloidin cutting. According to the author's experience, this microtome 



Fig. 217. — The Precision Microtome. 



considerably surpasses all other types in the accuracy of the work which may be 

 done with it. The rotary microtome was originally made in Germany, and 

 various patterns have been put upon the market by German, French, English, 

 and American manufacturers. The new pattern recently introduced by Messrs. 

 Bausch & Lomb embodies a considerable number of improvements, which render 

 the instrument (Fig. 218) very desirable for general laboratory use. It works 

 with accuracy, is very easy to manipulate, and cuts sections with extreme 



