NOTICES AND ABSTRACTS 



OF 



MISCELLANEOUS COMMUNICATIONS TO THE SECTIONS. 



MATHEMATICS AND PHYSICS. 



Mathematics. 



Page 



HoM ERSHAM Cox On the Parallelogram of Mechanical Magnitudes 1 



Mr. W. J. Macquorn Rankine's Summary of the Results of the Hypothesis 



of Molecular Vortices, as applied to the Theory of Elasticity and Heat 3 



on the Velocity of Sound in Liquid and Solid 



Bodies of Limited Dimensions, especially along prismatic masses of liquid... 4 



Mr. J. J. Waterston on a General Theory of Gases 6 



Light, Heat, Electricity, Magnetism. 



M. F. C. Bakewell on the Conduction of Electricity through Water 6 



Mr. Charles Brooke on a New Mode of Illuminating Opake Objects under 



the highest jwwers of the Microscope ■ 7 



on a New Arrangement for facilitating the Dissection 



and Drawing of Objects placed under the Microscope 7 



Professor J. D. Forbes on the Progress of Experiments on the Conduction of 



Heat, undertaken at the Meeting of the British Association at Edinburgh in 



1850 7 



Captain E. J. Johnson's Letter addressed to Lieut. -Col. Sabine 8 



Professor Powell's Remarks on Lord Brougham's Experiments on Light, &c. 



in the Phil. Trans. 1850. Part 1 11 



Professor G. G. Stokes on a new Elliptic Analyser 14 



Dr. John Tyndall on Diamagnetism and Magnecrystallic Action 15 



Professor Walker's Extract from a Letter addressed to Professor Phillips ... 19 



Professor E. Wartmann's Inquiries into some Physical Properties of the Solid 

 and Liquid Constituent Parts of Plants 19 



Mr. John Welsh's Description of a Sliding Rule for converting the observed 

 Readings of the Horizontal and Vertical Force Magnetometers into Variations 

 of Magnetic Dip and Total Force 20 



Astronomy, Meteors, Waves. 



Dr. Bateman's Account of the Astronomical Instruments in the Great Exhi- 

 bition 21 



Messrs. G. P. and R. F. Bond's Description of an Apparatus for making Astro- 

 nomical Observations by means of Electro-Magnetism 21 



Mr. J. P. Joule on a Method of Sounding in Deep Seas 22 



Rev. Professor Powell on M. Guyot's Experiment 23 



