ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



869 



Thanhoffers * (fig. 196) was formerly mucli used in the laboratory 

 of the Buda-Pest University, and has been somewhat modified to 

 answer Prof. L. v. Thanhofier's purpose. Two T-shaped strips of 

 platinum are fixed to a small piece of glass by Canada balsam. To 

 prevent their coming ofi", they are bent back and fastened to the other 

 side of the glass. The slide thus prepared is placed in a wooden or 



Fig. 19G. 



hard indiarubber frame. At one side of the frame two copper plates 

 with copper screws are fixed. These plates, which are somewhat 

 curved, lie upon the platinum strips. The poles of the battery are 

 connected with the screws. 



Briicke's t (fig- 197) consists of a plate of wood A with an opening 

 in the centre, on either side of which copper bands B B are let in and 



Fig. 197. 



aro connected with the poles of a battery. The slide C lies on these 

 bands, and is covered at both ends, above and below, with tin-foil. 



* Thanhoffer, op. cit., p. 91 (1 fig.). The name of the original designer is 

 not given. 



t Thanhoffer, op. cit., pp. 90-1 (1 fig.). Dippel, op. cit., p. 057 (1 fig.). 

 Btricker'H 'Muruial of Human and Comparative Hiatology.' Tiansl. by Power, 

 1870, pp. xx.-xxii. (1 fig.). 



Ker. 2.— Vol. V. 3 L 



