MECKEL'S cartilage, 179, 182, 229, 230. Medulla oblongata, 93. Medullary canal, 53; folds, 37, 48, 57; groove, 48, 57. Membrana limitans externa, 106. Membrane of Descemet, 102; of Reissner, 112; vitelline membrane 13, 20. Membrane-bones, 178, 233, 237, 238. Mesenteric veins, 171, 210. Mesoblast, 27, 45, 56, 196, 198, 199. Mid-brain, 78, 93, 145. Movements of the embryo, 223, 224. MUELLER, 92, 93, 133, 134, 156, 157, 228; duct of M. 144; M.'s duct, 126, 162; fibres of M., 107. Muscles, episkeletal, 159. Muscle-plates, 135, 136, 159. Sac; amniotic 41; embryonic 35. Sacculus hemisphericus, 115. SCHENK, 133, 137. SCHULTZE, Max, 106. SCHWARCK, 155, 157. Sections, 250-252, 254, 255, 258, 260, 261, 262, 263, 264. Segmentation, 22-26, 264, 265; se- Seminiferous tubules. See Tubuli seminiferi. Septum nasi, 237; septum of the bulbus arteriosus, 215; ventricular septum 172, 173. SERNOFF, 162, 167. Serous cavity, 38; layer, 45. Sexual eminence, 166. Shell-membrane, 12. Sinus rhomboidalis, 60, 190; termi nalis, 69; venosus, 123, 170. BEDFORD STREET, COVENT GARDEN, LONDON, September 1874 MACMILLAN & Co.'s CATALOGUE of WORKS in MATHEMATICS and PHYSICAL SCIENCE; including PURE and APPLIED MATHEMATICS; PHYSICS, ASTRONOMY, GEOLOGY, CHEMISTRY, ZOOLOGY, BOTANY; PHYSIOLOGY, ANATOMY, and MEDICAL WORKS generally; and of WORKS in MENTAL and MORAL PHILOSOPHY and Allied Subjects. MATHEMATICS. Airy.-Works by Sir G. B. AIRY, K.C. B., Astronomer Royal :ELEMENTARY TREATISE ON PARTIAL DIFFERENTIAL EQUATIONS. Designed for the Use of Students in the Universities. With Diagrams. New Edition. Crown 8vo. cloth. 5s. 6d. It is hoped that the methods of solution here explained, and the instances exhibited, will be found sufficient for application to nearly all the important problems of Physical Science, which require for their complete investigation the aid of Partial Differential Equations. ON THE ALGEBRAICAL AND NUMERICAL THEORY OF ERRORS OF OBSERVATIONS AND THE COMBINATION OF OBSERVATIONS. Crown 8vo. cloth. 6s. 6d. In order to spare astronomers and observers in natural philosophy the confusion and loss of time which are produced by referring to the ordinary treatises embracing both branches of probabilities (the first relating to chances which can be altered only by the changes of entire units or integral multiples of units in the fundamental conditions of the problem; the other concerning those chances which have respect to insensible gradations in the value of the element measured), this volume has been drawn up. It relates only to errors of observation, and to the rules, derivable from the consideration of these errors, for the combination of the results of observations. UNDULATORY THEORY OF OPTICS. Designed for the Use of Students in the University. New Edition. Crown 8vo. cl. 6s. 6d. The plan of this tract has been to include those phenomena only which admit of calculation, and the investigations are applied only to phenomena which actually have been observed. With ON SOUND AND ATMOSPHERIC VIBRATIONS. gs. A 2 SCIENTIFIC CATALOGUE. Airy (G. B.)—continued. A TREATISE ON MAGNETISM. Designed for the Use of Students in the University. Crown 8vo. 95. 6d. Ball (R. S., A.M.)—EXPERIMENTAL MECHANICS. A Course of Lectures delivered at the Royal College of Science for Ireland. By ROBERT STAWELL BALL, A. M., Professor of Applied Mathematics and Mechanics in the Royal College of Science for Ireland (Science and Art Department). Royal 8vo. 16s. "We have not met with any book of the sort in English. It eluci dates instructively the methods of a teacher of the very highest rank. We most cordially recommend it to all our readers."Mechanics' Magazine. Bayma.-THE ELEMENTS OF MOLECULAR MECHANICS. By JOSEPH BAYMA, S.J., Professor of Philosophy, Stonyhurst College. Demy 8vo. cloth. IOS. 6d. Third Boole.-Works by G. BOOLE, D.C.L, F.R.S., Professor of Mathematics in the Queen's University, Ireland :— A TREATISE ON DIFFERENTIAL EQUATIONS. Edition. Edited by I. TODHUNTER. Crown 8vo. cloth. 14s. "A treatise incomparably superior to any other elementary book on the subject with which we are acquainted."-Philosophical Magazine. A TREATISE ON DIFFERENTIAL EQUATIONS. Supplementary Volume. Edited by I. TODHUNTER. Crown 8vo. cloth. 8s. 6d. THE CALCULUS OF FINITE DIFFERENCES. Crown 8vo. cloth. 10s. 6d. New Edition revised. Cambridge Senate-House Problems and Riders, WITH SOLUTIONS:: 1848-1851.-PROBLEMS. By FERRERS and JACKSON. 8vo, cloth. 15s. 6d. 1848-1851.-RIDERS. BY JAMESON. 8vo. cloth. 7s. 6d. 1854.-PROBLEMS AND RIDERS. By WALTON and 1857.-PROBLEMS AND RIDERS. By CAMPION and 1860.-PROBLEMS AND RIDERS. By WATSON and ROUTH, Crown 8vo. cloth. 7s. 6d. 1864.-PROBLEMS AND RIDERS. By WALTON and WIL KINSON. 8vo. cloth. IOS. 6d. These volumes will be found of great value to Teachers and Students Cheyne.-Works by C. H. H. CHEYNE, M.A., F.R.A.S.:— |