50 



Dr. G. Gore. 



[Nov. 22, 



Conclusions : — 



1. That the secidiospores of Fuccinia phragmitis occur on Rumex 

 hydrolapalhum, crispus, obtusifolius, con-glomeratus, and Rheum officinale. 



2. That the aecidiospores of Fuccinia magnusiana have yet to be 

 discovered if the Fuccinia has any, which it probably has. 



3. That the ^eidium on Rumex acetosa is not connected with either 

 Fuccinia phragmitis or magnusiana. 



IV. " Some Relations of Heat to Yoltaic and Tkermo-Electric 

 Action of Metals in Electrolytes." By G. Gore, LL.D., 

 F.R.S. Received November 14. 1883. 



(Abstract.) 



The author states that the object of this research was " to ascertain 

 the thermo-electric action of a series of metals in particular liquids, 

 and to examine the relations of the thermo-electric to the chemico- 

 electric behaviour of metals in electrolytes, and to ordinary chemical 

 corrosion, and the source of the voltaic current." 



With this object, the thermo-electric tension series, also the chemico- 

 electric tension series, at 60° and 160° F. of thirteen metals in solu- 

 tions of twenty-two different salts, alkalies, and acids, were experi- 

 mentally found, and are shown in two tables. The same thermo- and 

 chemico- electric series were also determined in solutions of different 

 strengths of the same substances, and are also exhibited in two 

 tables ; and the effects of difference of strength of liquid upon the 

 orders of those series are inferred from the results. 



Several other tables contain series of determinations of the electric 

 potentials, in volts, of numerous thermo-electric, and also of chemico- 

 electric couples of the same series of metals in the weak solutions and 

 in the strong ones, and show the influence of strength, of liquid upon 

 thermo-electric and chemico-electric potential. The measurements of 

 potential were made by means of a new form of thermopile (see 

 " Proc. Birm. Phil. Soc," vol. iv, Part 1). 



The influence of temperature upon the chemico-electric potential of 

 those metals in the series of weak solutions, and also in the strong 

 ones, at 60° and 160° P., was also determined, and the results are 

 given in several tables. 



The " voltaic reversal points," or temperatures at which the two 

 metals of a voltaic pair balanced each other, and produced no current, 

 in fifty-four different cases discovered during the research, were also 

 determined and are given. The metals and solutions employed were 

 the same as those used in the previous series of experiments. 



