ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



145 



the cut-out oblong the space into whicli the paraf&n block is fitted. 



When the sides have been accurately pared down they are marked by 



means of the apparatus shown in fig. 31, which makes a series of holes in 



one of the planed-down sides. The holes and sides are then stained 



with soot or any other suitable medium, 



after which the block is dipped again Ftg. RO. 



in paraffin. 



For the purpose of plastic recon- 

 struction the author advises that ribbon 

 sections should not be cut, and in order 

 to unroll sections he advocates the use 

 of the apparatus shown in fig. 3,?. 

 This is essentially an iron table pro- 



FiG. 29. 



vided with a flap coming off at a right angle. Beneath the flap is placed 

 a spirit-lamp, and on the table the section. The position on the table 

 given to the section must of course vary with the heat. It should be so 

 placed that it gently unrolls itself. 



With regard to the modelling process it is only necessary to state 

 that the chief difficulty lies in making the wax-paper plates. For this 



Fig. 31. 



Fm. S2. 



purpose are required a lithographer's stone, strips of metal which vary 



m thickness but not in length and breadth (50 cm. by 1-5 cm.), and an 



iron roller. The thicknesses given are 0-4, 0-6, 0-8 0-9 1 l'-2 1-5 



1889. ' 'l ' 



