[ V ] 
XXIII. On the Sources of the Nitrogen of Vegetation; with special reference to the 
Question whether Plants assimilate Free or imcomhined Nitrogen. By John 
Bennet Lawes, F.B.S., FC.S., Joseph Henry Gilbert, Ph.B., F.B.S., F.C.S., 
and Evan Pugh, Ph.D., F.G.S. page 431 
XXIV. On th£ Indian Arc of Meridian. By the Venerable J. H. Pratt, M.A. , Archdeacon 
of Calcutta. Communicated by Professor Stokes, Sec. B.S 579 
XXV. Notes on the Generative Organs^ and on the Formation of the Egg in the Annulosa. 
By John Lubbock, Esg.., F.B.S. 595 
XXVI. On the Influence of Atmospheric Pressure upon some of the Phenomena of Com- 
bustion. By Dr. E. Frankland, F.B.S. 629 
XXVII. Account of Experiments made at Holyhead {North Wales) to ascertain the 
Transit-Velocity of Waves analogous to Earthquake Waves, through the Local Bock 
Formations. By Kobert Mallet, C.E., F.B.S. 655 
XXVIII. On the Construction of Specula of Six-feet Aperture; and a selection from the 
Observations of Nebulae made with them. By the Earl of Kosse, K.P., &c., 
F.B.S. 681 
XXIX. On the Elimination of Urea and Urinary Water, in relation to the Period of the 
Day, Season, Exertion, Food, Prison Discipline, Weight of Body, and other 
influences acting in the Cycle of the Year. By Edward Smith, M.D., LL.B., 
F.B.S., Assistant-Physician to the Hospital for Consumption and Diseases of the 
Chest, Brompton, Corresponding Fellow of the Academy of Sciences and Arts of 
Montpellier, and of the Natural History Society of Montreal, &c. . . . 747 
Index 835 
Appendix. 
Presents [ 1 ] 
EEEATTJM. 
Page 259 (seven lines from the bottom), upwards of 80 years, Females, Minimum, Encephalon, /br 15'25 
read 35 25. 
