NOTICE TO AUTHORS AND COMMUNICATORS. 



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

 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 diffuseness 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. 



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 m 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 VI, Cap. xii. 



NOTICES TO FELLOWS OF THE ROYAL SOCIETY. 



The Library and Offices will be closed for Easter Vacation from 

 Thursday, April I, until Saturday, April 10, inclusive. 



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 ' Year- 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 

 of the Postal Union. On application to Messrs. Harrison and Sons, 45, St. Martin's Lane, 

 these will be bound in volumes, in cloth, for 2s. 6d., or the cases for binding may be 

 purchased, price 1 s. 6d. 



The ' Philosophical Transactions ' are delivered, in volumes, in cloth covers, only to 

 those Fellows who call for them, or who send a written application to the Assistant 

 Secretary. Such an application may, if so desired, be filed as a standing order. 



The ' Philosophical Transactions ' are also delivered in the form of separate Papers, 

 post free, immediately on publication, to those Fellows who desire to have them in that 

 form. And, on application to Messrs. Harrison and Sons, 45, St. Martin's Lane, these 

 will be bound in a cloth case for 2s. 6d., or the cloth cases for binding may be 

 purchased, price Is. 6d. 



SUBSCRIPTION TO THE PROCEEDINGS OF THE ROYAL 



SOCIETY. 



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

 appearing on the wrappers ; or as completed volumes, bound in cloth, Series A, 20s., 

 Series B, 25s. per volume. 



The ' Proceedings * may also be obtained by subscription, for either or both series, 

 paid in advance, at special rates as under : — 



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



For this advance subscription, each series may be had in separate numbers, 

 mmediately on publication, or as completed volumes, bound in blue cloth. 



