PHILOSOPHICAL TEANS ACTIONS. 



Contents of Part I, 1880. 



I. On the Determination of the Rate of Vibration of Tuning-Eorks. By 

 Hebbeet M'Leod, F.C.S., and Geoege Sydenham Clabke, Lieut. R.E., 

 Royal Indian Engineering College, Cooper's Hill. 



II. The Contact Theory of Voltaic Action. — Paper No. III. By Professors 



W. E. Ayeton and John Peeey. 



III. Researches on the Comparative Structure of the Cortex Cerebri. By W. 



Beyax Lewis, L.B.C.P. (Lond.), Senior Assistant Medical Officer, West 

 Riding Lunatic Asylum, Wakefield. 



IV. Experimental Researches on the Electric Discharge with the Chloride of 



Silver Battery. By Waebex De La Rue, M.A., D.C.L., E.R.S., and 

 Hugo W. M^llee", Ph.D., F.R.S.— Part III. Tube Potential ; Potential 

 at a Constant Distance and Various Pressures ; Nature and Phenomena of 

 the Electric Arc. 



V. On the Conduction of Heat in Ellipsoids of Revolution. By C. Niyen, 

 M.A., Professor of Mathematics in Queen's College, Cork. 



VI. On some recent Improvements made in the Mountings of the Telescopes at 

 Birr Castle. By the Eael oe Rosse, F.R.S. 



VII. Concluding Observations on the Locomotor System of Medusa?. By Geoege 



J. Romanes, M.A., F.L.S. 



VIII. Researches on Explosives. — No. II. Fired Gunpowder. By Captain Noble 



(late R.A.), F.R.S., E.R.A.S., E.C.S., &c, and E. A. Abel, C.B., F.R.S., 

 V.P.C.S., &c, &c. 



IX. English Reproduction Table. By Dr. W. Faee, F.R.S. 



X. Agricultural, Botanical, and Chemical Results of Experiments on the Mixed 

 Herbage of Permanent Meadow, conducted for' more than twenty years in 

 succession on the same Land. — Part I. By J. B. Lawes, LL.D., F.R.S., 

 F.C.S., and J. H. Gilbeet, Ph.D., F.R.S., F.C.S., F.L.S. 



Index to Part I. 



PHILOSOPHICAL TRANSACTIONS. 

 Part I, 1880, price £2 bs. 



Extra volume (vol. 168) containing the Reports of the Naturalists attached to the 

 Transit of Venus Expeditions. Price £3. 



Sold by Harrison and Sons. 



Separate copies of Papers in the Philosophical Transactions, commencing with 1875, 

 may be had of Trlibner and Co., 57, Ludgate Hill. 



