CONTENTS. 
IV. The Blood-corpuscle considered in its different Phases of Development in the Animal 
Series. Memoir I. — Vertehrata. By T. Wharton Jones, F.R.S., Lecturer on 
Anatomy , Physiology and Pathology, at the Charing- Cross Hospital, 8$c. page 63 
V. The Blood- corpuscle considered in its different Phases of Development in the 
Animal Series. Memoir II. — Invertehrata. By T. Wharton Jones, F.R.S., 
Lecturer on Anatomy, Physiology and Pathology, at the Charing- Cross Hos- 
pital, 8$c 89 
VI. The Blood-corpuscle considered in its different Phases of Development in the 
Animal Series. Memoir III. — Comparison between the Blood-corpuscle of the 
Vertehrata and that of the Invertehrata. By T. Wharton Jones, F.R.S., 
Lecturer on Anatomy, Physiology and Pathology, at the Charing- Cross Hos- 
pital, fyc 103 
VII. (An a point connected with the dispute between Keil and Leibnitz about the 
invention of Fluxions. By A. De Morgan, Esq., F.R.A.S., &fc. Communicated 
by S. Hunter Christie, Esq., Sec. R.S., &fc 1 07 
V III. On the Action of the Rays of the Spectrum on Vegetable Juices. Extract of a 
Letter from Mrs. M. Somerville to Sir J. F. W. Herschel, Bart., dated Rome, 
September 20, 1845. Communicated by Sir J. Herschel Ill 
IX. On the Use of the Barometric Thermometer for the Determination of Relative 
Heights. By James R. Christie, Esq., of the Royal Military Academy. Com- 
municated by S. Hunter Christie, Esq., Sec. R.S., fyc 121 
X. Investigation of an Extensive Class of Partial Differential Equations of the 
Second Order, in which the Equation of Laplace’s Functions is included. By 
G. W. Hearn, Esq., of the Royal Militai'y College, Sandhurst. Communicated 
by Sir John F. W. Herschel, Bart., F.R.S., fyc 133 
XI. On Spontaneous Nitrification. By C. F. Schoenbein, Professor of Chemistry in 
the University of Bdle. Communicated by Michael Faraday, Esq., F.R.S., 
137 
