98 Galvanism^ from Galvani to Ohm. 



conductivity inherent in the conductor and on another variable 

 which bears to electricity the same relation that temperature 

 bears to heat ; and, moreover, it was realized that this latter 

 variable is the link connecting the theory of currents with 

 the older theory of electrostatics. These principles were a 

 sufficient foundation for future progress; and much of the 

 work which was published in the second quarter of the century 

 was no more than the natural development of- the principles 

 laid down by Ohm.* 



It is painful to relate that the discoverer had long to wait 

 before the merits of his great achievement were officially 

 recognized. Twenty- two years after the publication of the 

 memoir on the galvanic circuit, he was promoted to a university 

 professorship ; this he held for the five years which remained 

 until his death in 1854. 



* Ohm's theory was confirmed experimentally by several investigators, among 

 whom may be mentioned Gustav Theodor Feehner(i. 1801, d. 1887) (Maassbestim- 

 mungen iiber die Galvanische Kette, Leipzig, 1831), and Charles Wheatstone 

 (b. 1802, d. 1875) (Phil. Trans,, 1843, p. 303). 



