vi Contents. 



February 27, 1893. page 



On the histology of the Blood of Eabbits which have been rendered 



immune to Anthrax. By Lim Boon Keng 60 



On numerical Variation in Digits, in illustration of a principle of 



Symmetry. By W. Bateson 61 



March 13, 1893. 



On a compound of gold and cadmium. By C. T. Heycock ... 61 

 On the Spectra of electric discharges without electrodes through gases. 



By H. F. Newall 61 



Exhibition of some photographs of the Solar Spectrum by Mr Geo. Higgs. 



By R. T. Glazebrook 61 



An experiment on the vibrations of a spiral spring. By L. R. Wilber- 



force 61 



May 1, 1893. 



On the torsional strength of a hollow shaft. By H. M. Macdonald . 62 



On the Astronomical Theory of glacial periods. By E. W. Hobson . 68 

 On Black Globes and some convenient uses of them. By J. Y, 



Buchanan 68 



A Provisional Theory of Kerr's Experiments on the Reflection of Light 



from an Electromagnet. By A. B. Basset 68 



May 15, 1893. 



Exhibition of abnormal forms of Spirifera lineata (Martin) from the 



Carboniferous Limestone. By F. R. Cowper Reed .... 81 

 Exhibition of Post-Glacial Mammalian bones from Barrington, recently 



acquired by the Museum of Zoology. By S. F. Harmer . . .81 

 Exhibition of a specimen shewing Karyokinetic division of the nuclei in 



a Plasmodium of one of the Mycetozoa. By J. J. Lister ... 81 

 Observations on the Flora of the Pollard Willows near Cambridge. By 



J. C. Willis and I. H. BurkiU . . . . " . . . .82 

 Notes on the Plants distributed by the Cambridge dust-carts. By T. H. 



Burkill . . . . " 92 



May 29, 1893. 



On the Kinematics of a Plane, and in particular on Three-bar Motion ; 



and on a Curve-tracing Mechanism, with exhibition of apparatus. 



By Prof. Cayley . » . . 95 



On Contour Integration. By H. F. Baker 95 



Electric stability in crystalline media. By J. L armor .... 95 



