Ill 
PAGE 
On the Number of Dust Particles in the Atmosphere of certain Places in Great 
Britain and on the Continent, with Remarks on the Relation between the 
Amount of Dust and Meteorological Phenomena. By John Aitken, F.R.S. 
(With Three Plates), . . . . . . . .193 
Larix Europcea as a Breeding-Place for Hylesinus piniperda. By William 
Somerville, D.(Ec., B. Sc., . . . . . . . 255 
Researches on Micro-Organisms, &c. Part III. By Dr A. B. Griffiths, F.R.S. 
(Edin.), F.C.S. (Bond. & Paris), Member of the Physico-Chemical Society 
of St Petersburg, &c., . ... . . . . . 257 
On the Solution of the Three-Term Numerical Equation of the nth. Degree. By 
the Hon. Lord M‘Laren, . . . . . . .270 
On the Reflexion-Caustics of Symmetrical Curves. By the Hon. Lord McLaren. 
(With Two Plates), . . . . . . . .281 
Synthesis by means of Electrolysis. — Part III. Synthesis of ?i-Dicarbodecahex- 
anic Acid. By Prof. Crum Brown and Dr James Walker, . . 297 
Synthesis by means of Electrolysis. — Part IV. Synthesis of Suberic and n- Di- 
carbododecanic Acids. By Prof. Crum Brown and Dr James Walker, . 299 
Preliminary Experiment on the Thermal Conductivity of Aluminium. By A. 
Crichton Mitchell, Esq., B.Sc., ...... 300 
Note on Electrolytic Conduction. By Robert L. Mond, Esq., B.A., . . 302 
List of West Australian Birds, showing their Geographical Distribution through- 
out Australia, including Tasmania. By A. J. Campbell, Esq., F.L.S. 
Communicated by Rev. James MacGregor, D.D., F.R.S. Edin. (With a 
Map), .......... 304 
Pharmacology of Morphine and its Derivatives. By D. B. Dott, Esq., F.C.S., 
F.I.C.,'and Ralph Stockman, M.D., Research Scholar of the British Medical 
Association , . . . . . . . 321 
A New Method for Determining Phosphorus in Organic Phosphorus Compounds. 
By Prof. E. A. Letts and R. F. Blake, Esq., Queen’s College , Belfast , . 382 
List of the Fossil Dipnoi and Ganoidei of Fife and the Lothians. By R. H. 
Traquair, M.D., F.R.S., . . . . . . . 385 
The Interactions of Circular and Longitudinal Magnetisations. By Prof. C. G. 
Knott, D.Sc., . . . . . . . . 401 
Closing Address. By the Hon. Lord M‘Laren, ..... 406 
Meetings of the Royal Society — Session 1889-90, . . . .411 
Donations to the Library, ........ 423 
Index, .......... 427 
Obituary Notices. ( See separate Index), ...... 432 
