NOTICE TO AUTHORS AND COMMUNICATORS. 



The Council have had under consideration the rapid increase of the Society'i 

 expenditure on publications. In view of the necessity for economy, authors of papers 

 are urgently requested to see that their communications are put in as concise a form as 

 possible. Delay in decisions regarding publication, as well as subsequent trouble to 

 authors, is often caused by diSuseness or prolixity. MSS. must be type-written or at 

 least written in a legible hand, and properly prepared as copy for press. Type-written 

 transcript should in all cases be carefully revised by the author before being presented. 

 It is desirable that authors should retain copies of their MSS. for reference. 



Every paper must be accompanied by a summary not exceeding 300 words in length. 



Authors are requested to refer to a Memorandum on Mathematical Notation 

 published in these ' Proceedings,' 1 909, Series A, vol. 82, p. 1 4, and to adhere to the 

 suggestions therein contained, so far as possible. 



Authors are further requested to send in all drawings, diagrams or other illustrations 

 in a state suitable for direct photographic reproduction. They should be drawn on 

 a large scale in Indian ink on a smooth white surface, with temporary lettering in 

 pencil. Great care should be exercised in selecting only those that are essential. 

 Where the illustrations are numerous, much time would be saved if the authors would 

 indicate in advance those which, if a reduction of their number is found to be required, 

 might be omitted with least inconvenience. 



" It shall be the duty of each Fellow or Foreign Member to satisfy himself that any letter, report or 

 other paper which he may communicate, is suitable to be read before the Society." — Statute 64, Cap. lii. 



NOTICES TO FELLOWS OF THE ROYAL SOCIETY. 



The Council have directed that the Minutes of the Meetings of the Society shall 

 be sent out as an inset in the ' Proceedings,' separately paged, and shall afterwards be 

 republished in the * Yeeur-Book.' 



The ' Proceedings,' both the Physical and the Biological Series, are sent in the 

 ordinary course by post to every Fellow of the Society who resides within the limits o( 

 the Postal Union. On application to Messrs. Harrison and Sons, Ltd., St. Martin's Lane, 

 London, W.C. 2, these will be bound in volumes, in cloth, for 5s., or the cases for 

 binding may be purchased, price 2s. 3d. 



The ' Philosophical Transactions ' are now issued in the form of separate Papers, 

 and are delivered post free, immediately on publication, to those Fellows who desire to 

 have them in that form. On application to Messrs. Harrison and Sons, Ltd., St. Martin's 

 Lane, London, W.C. 2, these issues will be retained, and supplied in volume form in 

 cloth binding. 



SUBSCRIPTION TO THE PROCEEDINGS OF THE ROYAL 



SOCIETY. 



The ' Proceedings ' are on sale to the public, on publication, at the prices appearmg 

 on the wrappers ; or may be obtained by subscription, paid in advance. 



Series A, 1 5s. per volume. Series B, 20s. per volume. 



Complete volumes, bound in cloth. 



Series A, 20s. per volume. Series B, 25s. per volume. 



