358 Respiration of Myriapoda. " Ginger-beer Plant ." [Jan. 21, 



tion, if the solution surrounding one of the electrodes contains oxygen 

 in solution. He establishes, further, the fact that in such cases the 

 metal actually enters into solution, and explains thereby a variety of 

 phenomena. From his observations there seems little doubt that even 

 in a solution of silver nitrate silver may dissolve to a slight extent. 

 The amount so dissolved is possibly increased when the silver is in 

 the nascent state, and may then become measurable.* 



We draw the general conclusion from, our experiments that the 

 true electrochemical equivalent of silver is probably not quite one 

 part in a thousand greater than the value given by Lord Rayleigh, 

 but that, if the experiments are conducted in air and under circum- 

 stances similar to those under which Lord Rayleigh's measurements 

 were made, the anomalies described by us do not interfere with the 

 use of the silver voltameter as a current measurer. On the contrary, 

 the fact that we were able to show the existence of systematic 

 differences amounting to not more than two parts in ten thousand is 

 a proof of its trustworthiness. 



VI. "A new Mode of Respiration in the Myriapoda." By 

 F. G. SINCLAIR (formerly F. G. HEATHCOTE), M.A., Fellow 

 of the Cambridge Philosophical Society. Communicated 

 by A. SEDGWICK, F.R.S. Received January 8, 1892. 



[This is a new version of the Paper read November 26, 1891. See 

 ante, p. 200.] 



VII. " The ' Ginger-beer Plant/ and the Organisms composing 

 it: a Contribution to the Study of Fermentation-yeasts 

 and Bacteria." By H. MARSHALL WARD, M.A., F.R.S., 

 F.L.S., Professor of Botany at the Forestry School, Royal 

 Indian Engineering College. Coopers Hill. Received 

 January 14, 1892. 



[The Paper printed at page 261, ante, contains the substance of this 

 Paper in abstract.] 



* I have assured myself by experiment that the well-known diminution in weight 

 of copper in copper sulphate does not take place in vacuo, care being taken to 

 remove the dissolved oxygen completely. Experiments are at present in progress to 

 investigate the electrolysis of copper in vacuo. A. S. 



