LIST OF THE CONTRIBUTOES, 
AVITH REFERENCES TO THE SEVERAL ARTICLES CONTRIBUTED 
BY EACH. 
Andeews, William. page. 
Note on the capture of ZipMus Sowerbi, .... 49 
Apjohn, James, M. D., F.R.S. 
On a new step in the Proximate Analysis of Saccharine 
matters, .......... 1 
Archee, William, F.R.S. 
On some Freshwater Ehizopods, new, or little known (Plates 
xii. and xiii.), 67 
Notice of the genus Tetrapedia (Reinseh), and of two kindred 
new forms (Plate xxi.), 296 
On a minute Nostoc with Spores. With brief notice of recently- 
published observations on CoUema, 310 
Ball, R.S., LL.D., F.R.S. 
On the small Oscillations of a Rigid Body about a fixed point 
under the action of any forces, and more particularly when 
gravity is the only force acting (abstract), . . . 11 
An account of experiments upon the motion of Yortex Rings in 
air (abstract), . . . . ' . . . .113 
The Theory of Screws, Part 1. A geometrical study of the 
Kinematics, Equilibrium, and small Oscillations of a Rigid 
Body (abstract), 233 
Notes on Applied Mechanics : 
i. Parallel Motion, . . ... . .243 
ii. The Contact of Cams, . . . . . . 244 
iii. On the Theory of Long Pillars, . . . .491 
iv. On a Hydro-dynamical Theory due to Professor 
Stokes, . . . . . . . .492 
On a new approximation to the orbit of the Binary Star | Ursse 
Majoris (Plates xxii. and xxiii.), 316 
Screw Co-ordinates, and their applications to problems on the 
Dynamics of a Rigid Body (abstract), .... 552 
Baekee, John, M. D. 
On the Illumination of Microscopical objects (Plates i., ii., and 
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