Comparison of Magnetic Instruments at Kew Observatory. 155 



Dr. Mond, Professor Ramsay, and Dr. J. Shields. On the Occlusion 

 of Oxygen and Hydrogen by Platinum Black. Part II. 



J. E. Murray. On Contact Electricity of Metals. 



W. Gardiner. The Histology of the Cell Wall, with Special Refer- 

 ence to the Mode of Connection of Cells. 



H. L. Callexdar and H. T. Barnes. On the Variation of tlie Elec- 

 tromotive Force of Different Forms of the Clark Standard Cell 

 with Temperature and with Strength of Solution. 



Lord Ratleigh. On the Viscosity of Hydrogen as affected by 

 Moisture. 



The following Papers were read : — 



I. " Account of a Comparison of Magnetic Instruments at Kew 

 Observatory." By C. Chree, Sc.D., F.R.S., Superintendent. 



II. " Note on the Influence of very Low Temperatures on the Germi- 

 native Power of Seeds." By Horace T. Brown, F.R.S., and 

 F. Escombe, B.Sc, F.L.S. 



III. " On the Structure and Affinities of Fossil Plants from the 



Palaeozoic Rocks. II. On Spencerites, a new Genus of 

 Lycopodiaceous Cones from the Coal-measures, founded on 

 the Lepidodendron Spenceri of Williamson." By D. H. 

 Scott, M.A., Ph.D., F.R.S., Hon. Keeper of the Jodrell 

 Laboratory, Royal Gardens, Kew. 



IV. "Antagonistic Muscles and Reciprocal Innervation. Fourth 



Note." By C. S. Sherrington, F.R.S., and Dr. E. H. Hering. 



At the request of the President, Mr. Gardiner made an oral state- 

 ment on the subject of his Paper published during the vacation (see 

 list above). 



" Account of a Comparison of Magnetic Instruments at Kew 

 Observatory." By C. Chree, Sc.D., F.R.S., Superintendent. 

 Received October 26— Read November 18, 1897. 



Last July, M. T. Moureaux, of the Pare Saint-Maur Observatory, 

 near Paris, brought over to England the travelling instruments em- 

 ployed in his magnetic survey of France, and a comparison was made 

 between these and the standard magnetic instruments at Kew 

 Observatory. At the expressed desire of the Kew Observatory Com- 

 mittee, I submit on their behalf a brief account of the comparison 

 and its results. 



The comparison serves to connect the standard instruments at 

 Kew Observatory with the standard French instruments at Pare 

 Saint-Maur, the latter, as M. Moureaux has had the goodness to 



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