CONTENTS. 
V 
On the Physiology of Wings : being an Analysis of the Movements 
by which Flight is produced in the Insect, Bat, and Bird. By 
James Bell Pettigrew, M.D., F.R.S. Communicated by Professor 
Turner, ........ 336 
Address on “ The Results of the More Recent Excavations on the 
Line of the Roman Wall in the North of England.” By Dr J. 
Collingwood Bruce, ....... 350 
Note on two Species of Foraminifera, and on some Objects from the 
Nicobar Islands of great Ethnological interest. By T. C. Archer, 
Esq., ........ 353 
Certain Phenomena applied in Solution of Difficulties connected with 
the Theory of Vision. By R. S. Wyld, Esq,, . . , 355 
Additional Note on the Motion of a Heavy Body along the Circum- 
ference of a Circle. By E. Sang, Esq., . 361 
On the Capture of a Sperm Whale on the Coast of Argyleshire, with 
a Notice of other Specimens caught on the Coast of Scotland. By 
Professor Turner, ....... 365 
On the Efficient Powers of Parturition. By Dr J. Matthews Duncan, 370 
On the Pentatonic and other Scales employed in Scottish Music. By 
the Hon. Lord Neaves, . . . . . .382 
On the Motion of Free Solids through a Liquid. By Sir William 
Thomson, ........ 384 
Laboratory Notes. By Professor Tait — 
1. On Thermo-electricity, ..... 390 
2. On Phyllotaxis, . . . . . .391 
Account of the Extension of the Seven-Place Logarithmic Tables, 
from 100,000 to 200,000. By Edward Sang, Esq., . . 395 
On the Place and Power of Accent in Language. By Professor 
Blackie, ........ 395 
Notice of Exhibition of Vegetable Spirals. By Professor Alexander 
Dickson, ........ 397 
On the Old River Terraces of the Spey, viewed in connection with 
certain proofs of the Antiquity of Man. By the Rev. Thomas 
Brown, F.R.S.E., ....... 399 
On the Gravid Uterus and Arrangement of the Foetal Membranes in 
the Cetacea. By Professor Turner, . . . .407 
Note on some Anomalous Spectra. By H. F. Talbot, Hon. F.R.S.E., 408 
Laboratory Notes. By Professor Tait — 
1. On Anomalous Spectra, and on a simple Direct- vision Spec- 
troscope, ....... 410 
2. On a method of illustrating to a large Audience the com- 
position of simple Harmonic Motions under various con- 
ditions, . . . . . . .412 
3. On a simple Mode of explaining the Optical Effects of 
Mirrors and Lenses, . . . . .412 
On the Structure of the Palceozoic Crinoids, By Professor Wyville 
Thomson, ........ 415 
On the Formation and Decomposition of some Chlorinated Acids. By 
J. Y. Buchanan, A.M., . . . . . 419 
Notes on the Antechamber of the Great Pyramid. Based on the 
Measures contained in vol. ii. “Life and Work at the Pyramid,” by 
C. Piazzi Smyth. By Captain Tracey, R.A. Communicated by 
St John Vincent Day, C.E., F.R.S.E., .... 422 
Experiments and Observations on Binocular Vision. By Edward 
Sang, Esq., ........ 433 
