639 



ever given British botanists those advantages in forming their herba- 

 ria, which are now realized by membership of the Botanical Society 

 OF London. 



Regulations for the exchange of British Specimens. — 1. The So- 

 ciety exchanges specimens with any Member ; also with foreign bo- 

 tanists, who are not required to become members. 



2. The annual subscription entitles a Member to claim fifty species, 

 without the necessity of contributing specimens in return. — [N.B. In 

 justice to those who do contribute them, the non-contributing mem- 

 bers are thus supplied from the surplus specimens, which are not 

 required by Contributors for the same year.] 



3. The return made to any Contributor in future, will not bear refe- 

 rence to the number of specimens sent by him ; but is to be deter- 

 mined by their condition and quality, and by the exactness of his 

 attention to these regulations. — [N. B. It has been found that the 

 parcels which include the greatest number of specimens, are often the 

 least valuable to the Society ; the numbers being made out by break- 

 ing the plants into fragments, — by introducing common species, not 

 likely to be useful to the Members, — or by attempting to dry too 

 many specimens in proportion to the quantity of paper used, and thus 

 spoiling the whole lot. A parcel is set down " Good," when it con- 

 tains complete and well-dried examples, whether few or many.] 



4. Contributors may send parcels at any season convenient to them- 

 selves ; a return parcel to be made up for each Contributor, as soon 

 as practicable after receipt of one from him. 



5. Lists of desiderata may be made by attaching a short horizontal 

 mark before the names of the species and varieties in the ' London 

 Catalogue ;' the marks being prefixed only to those which are requir- 

 ed by the applicant. If preferred, a manuscript list may be sent 

 instead, including both the numbers and the names, written in the 

 same order or series in which they are printed in the ^ London Cata- 

 logue.' 



6. Lists of the Society's desiderata will be supplied to the contri- 

 buting Members from time to time. And in order to prevent the 

 accumulation of useless specimens, Contributors are requested to send 

 only the species asked for ; an exception to this rule, however, being 

 made in the case of newly discovered species, or remarkable varieties 

 not included in the ' London Catalogue.' 



7. It is greatly more convenient for the Society to ha.ve few species 

 and many specimens sent in the same parcel.' — [N. B. Fifty speci- 

 mens of one really scarce species, may often be more useful than five 



