[ viii ] 
XXII. A Comparison of the late Imperial Standard Troy Pound weight with a Platina 
copy of the same, and with other standards of authority. Communicated by Pro- 
fessor Schumacher, For. Memb. R.S., in a Letter to F. Baily, Esq., V.P. and 
Treas. R.S page 457 
XXIII. On the Brain of the Negro, compared with that of the European and the Orang- 
Outang. By Dr. Frederick Tiedemann, Professor of Anatomy and Physio- 
logy in the University of Heidelberg, and Foreign Member of the Royal So- 
ciety 497 
XXIV. On the Respiration of Insects. By George Newport, Esq., Member of the 
Royal College of Surgeons, and of the Entomological Society of London. Com- 
municated by P. M. Roget, M.D., Sec. R.S. 529 
XXV. On the Connexion of the Anterior Columns of the Spinal Cord with the Cere- 
bellum. By Samuel Solly, Esq., Lecturer on Anatomy and Physiology at 
St. Thomas s Hospital. Communicated by P. M. Roget, M.D. Sec. R.S. 567 
XXVI. On the Temperatures and Geological Relations of certain Hot Springs, particu- 
larly those of the Pyrenees ; and on the Verification of Thermometers. By 
James D. Forbes, Esq. F.R.SS. L. 8§ E., F.G.S., 8$c., and Professor of Natural 
Philosophy in the University of Edinburgh 571 
Appendix. 
Meteorological Journal kept at the Apartments of the Royal Society, by order of the 
President and Council. 
CORRIGENDA. 
Page 350, line 9, for of, read in which, and after called, insert is employed. 
Page 352, line 25, for it is excited, read the stimulus which excites it is applied. 
Page 353, line 9 from bottom, for effects, read effect. 
Page 355, in the beginning of the first note, insert Philosophical Transactions for 1822. 
Page 358, line 1, after shocks, insert “ a fact analogous to the division of the spinal marrow leaving unim- 
paired its influence on the secreting and assimilating organs.” — And line 7 ,for 1829, read 1833. 
Page 360, line 1 1 from bottom, after as well as, insert the maintenance of animal temperature and. — And in 
the oth line below this line, after 1815, insert and 1831. 
Page 361, line 10 from bottom of text, after muscular, insert and sensorial, and/or power, read powers. 
Page 362, line 5, for agents of that, read external. 
Page 3 6S, lines 11 and 16, before nerves, insert vital, and after or, insert the. — And line 14, after part, 
insert every part being supplied with nerves belonging to both systems. — And in line 27 , for this class of nerves, 
read nerves of sensation. 
Page 369, line 7, after system, insert and through the latter system overall parts of our frame. — And line 8, 
after latter, insert system. 
Page 871, line 6, after system, insert independently of the means of obtaining nourishment. — And line 6 
from the bottom, for system, read systems. 
Page 376, line 7, after organs, insert under which circumstances medicine always operates as a permanent 
tonic. — And in line 24, after dominion, insert see Dr. Roget’s Treatise on Electricity. 
