ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



841 



wood nailed to tlie table round the instrument, so that it cannot move 

 while being worked. 



The sections are prevented from rolling up by fixing in the joint of 



Fig. 156. 



the object-holder a camel' s-hair brush, so that the latter just touches the 

 surface of the section or the paraffin. 



New Section-stretcher, with arrangements for removing the Sec- 

 tion.* — Prof. H. Strasser describes a device invented by him for keeping 

 sections straight and causing them at the same time to adhere to a paper 

 band which is one of the principal parts of the apparatus. Over the object 

 and the knife-blade a paper band is arranged parallel to the long axis of 

 the microtome. One end is clamped to the object-holder, and the other 

 kept taut by a weight connected with the band by a cord running over a 

 roller. The band is made to just touch the surface of the object by 

 means of a metal roller of 1 to 1^ cm, in diameter. The roller can be 

 placed in any position by means of a universal joint, and it is made to 

 move up and down in the same groove as the knife-carrier, by means of 

 a similar carrier. The roller is then adjusted parallel to the edge of the 

 knife, and thus the section is kept from curling up by the superjacent 



* Zcitschr f. Wisd. Mikr., iv. (1SS7) pp. 218-9. 



