Errata in Messrs. Stoney and Reynolds's Paper on the Cause of the Interrupted 

 Spectra of Gases, Phil. Mag. July 1871. 

 Page 47, line 2, for (O+fr) read ($+% . 2tt). 

 „ - „ 3 } for(6+fr) read (6+%. 2n). 

 „ - „ 4,/or(0+**r)r«irf(0+f.2ir). 

 „ — „ 5,for{6+U)read(0+i.2ir). 

 „ — „ 16, for form (5) read form (7). 



ZOOLOGICAL RECORD ASSOCIATION. 

 This ASSOCIATION has been formed for the purpose of continuing the pub- 

 lication of the * Record of Zoological Literature/ commenced six years ago by 

 Dr. Gunther, F.R.S., who has resigned the Editorship to Professor Newton. 



The ' Record' consists of an Annual Volume, containing a very complete abs- 

 tract of and index to the Zoological Literature of the preceding year, and its use 

 has been so generally recognized that for the last four years the British Associa- 

 tion has voted (on the unanimous recommendation of the Committee of the Bio- 

 logical Section) a liberal grant in its aid. 



The Contributors to the forthcoming volume are : — 



Mammalia, Reptilia, and Pisces— Dr. Gunther, F.R.S. 

 Aves—K. E. Dresser, F.Z.S., and R. B. Sharpe, F.L.S. 

 Mollusca, Molluscoidea, and Crustacea — Dr. E. von Martens, F.M.Z.S. 

 Arachnida and Myriopoda — Rev. O. Pickard-Cambridge, C.M.Z.S. 

 Coleoptera and Hymenoptera—lZ. C. Rye. 

 Lepidoptera — W. F. Kirby. 

 Diptera—G. H. Verrall. 



Neuroptera and Orthoptera — R. M'Lachlan, F.L.S. 

 Rhynchota — John Scott. 

 Vermes — E. Ray Lankester. 



Echinodermata, Ccelenterata, and Protozoa — Professor Traquair, M.D. 

 This Association consists of Members and Subscribers. The Members are 

 liable to the extent of j£5, in the event of the funds from all other sources not 

 being equal to meet the Annual Expenditure. 



Subscribers pay annually on the 1st of July Twenty Shillings, but incur no 

 other liability. 



Gentlemen wishing to join the Association as Members or as Subscribers are 

 requested to communicate with the Secretary, H. T. Stainton, F.R.S., Mounts- 

 Held, Lewisham, near London, S.E. 



*** Upwards of Eighty of the leading Zoologists of the country have joined 

 the Association as Members. 



ROYAL INSTITUTION OF GREAT BRITAIN, 

 ALBEMARLE STREET, W. 



The next ACTONIAN PRIZE, or PRIZES, will be awarded in the year 

 1872 to an Essay, or Essays, illustrative of the Wisdom and Beneficence of the 

 Almighty. 



The subject is "The Theory op the Evolution of Living Things." 

 The Prize Fund is Two Hundred Guineas, and it will be awarded as a single 

 Prize, or in sums of not less than One Hundred Guineas each, or withheld alto- 

 gether, as the Managers in then judgment shall think proper. 



Competitors for the Prize are requested to send their Essays to the Royal In- 

 stitution on or before June 30, 1872, addressed to the Secretary; and the adjudi- 

 cation will be made by the Managers in December 1872. 



July 1871. H. BENCE JONES, Hon. Sec. R.I. 



Just published, in 8vo, price 10s. 6d. cloth, 

 A TREATISE ON TERRESTRIAL MAGNETISM. 



Containing an outline of the Discoveries and Theories connected therewith ; an 

 Inquiry as to whether the Terrestrial Sphere has four or only two Magnetic Poles; 

 on the Probable Causes of Terrestrial Magnetism ; on the Irregularities observed 

 in the Secular Variation, &c. 



William Blackwood and Sons, Edinburgh and London. 



[ADVERTISEMENTS continued on 3rd page of Cover. 



