CONTENTS. 
PAGE 
The' absorption spectra of some compounds obtained from pyridine and 
collidine. By J. E. Purvis ........ 435 
The limitations of the copper-zinc couple method in estimating nitrates. 
By J. E. Purvis and R. M. Courtauld ...... 441 
Description of a microcephalous new-born pig in which the face and the 
fore-parts of the brain were undeveloped , and the bucco-pharyngeal 
membrane remained imperforate. (With Plates XV and XVI.) By 
W. L. H. Duckworth 447 
On six new species of Ixodidae , including a second species of the new 
genus Rhipicentor N. and W. By W. F. Cooper and L. E. 
Robinson . . . 457 
A Double Sulphate of Guanidine and Aluminium. By F. FerrabOschi 471 
On the property of a double-six of lines , and its meaning in hyper- 
geometry. By H. W. Richmond ....... 475 
Report on the brain of a microcephalia idiot with bilateral porencephaly. 
(With Plate XVII.) By W. L. H. Duckworth .... 478 
The spectrum of the discharge from a glowing lime cathode in mercury 
vapour. By F. Horton 501 
On some new and obscure species of the genus Haemaphysalis of the 
Ixodidae. By C. Warburton 508 
On Monotone Sequences of Continuous Functions. By W. H. Young . 520 
On the Fauna of the Bradford Coke Bed Effluent , von Dr A. Meixner . 530 
The Geographical Distnbution of the Acanne Family Oribatidae. By 
C. Warburton . . 532 
The Formation of y-Pyrone Compounds from Acetylenic Acids. By 
S. Ruhemann . 535 
The Action of Mustard Oils on the Ethyl Esters of Malonic and Cyano- 
acetic Acids. By S. Ruhemann . . . . . , 535 
On the formation of lactic acid and carbonic acid during muscular con- 
traction and rigor mortis. By P. W. Latham 536 
On the complete hydrolytic decomposition of egg-albumin at 180° C. ; and 
on the constitution and synthesis of dead and living albumin. By 
P. W. Latham . 537 
The nature of the y rays. By J. J. Thomson 540 
On the velocity of Secondary Cathode Rays from gases. By J. J. 
Thomson 541 
Relation between the Geographical Distribution and the classification of 
the Onychophora. By A. Sedgwick ...... 546 
