.868 



SUMMAEY OF CURBENT EESEARCHES RELATING TO 



liigh powers, and its use is practically therefore limited to large 

 uncovered objects, such as the larger Infusoria, Rotatoria, &c. 



SchacMs * plan was simply to cement two platinum wires to the 

 slide extending beneath the cover-glass. 



Jendrdssik and Mezey's f (fig. 194) is now used in the Buda-Pest 

 physiological laboratory. It consists of a slide which has two 



Fig. 194. 



parallel grooves about 3' 5 mm. apart. At both ends of these small 

 holes are bored, through which thin platinum wire is passed, so as to 

 fill the grooves and be in contact beneath with two metal plates 

 attached to the stage of the Microscope ; these plates are connected 

 with the poles of a battery. The designers used this apparatus for 

 the microscopical examination of the contraction of muscle-fibre. 



Another plan J is to take a piece of silvered looking-glass and 

 remove the quicksilver in the centre, leaving two narrow strips. 



Kiihne § attached to the slide pieces of platinum foil of the form 

 shown in fig. 195, placing upon them small leaden blocks which were 

 connected by wires with the battery. 



* Dippel, op. cit., pp. 656-7. 



t Thanhoffer, L. v., 'Das Mikroskop und seine Anwendung,' 1880, pp. 91-2 

 (1 fig.). Dippel, op. cit., pp. 658-9 (1 fig.). 

 X Dippel, op. cit., p. 657. 

 § Ibid., p. 657 (1 fig.). 



