XJ LB 8. 



1. The objects of the Watson Botanical Exchange Club are to promote 

 more intercourse between British botanists, and to study, as much as possible, 

 British plants belonging to critical genera. 



2. The subscription is 5s. a year, and is due on Jan. ist. 



3. a. Members may send to the Distributor for the time being, before 

 January 31st, each year, parcels of plants for distribution, and they will receive 

 in return plants in proportion to the number and quality of those sent. 



b. Each plant must bear a label giving the name, place where collected, 

 collector's name, and date. To prevent possible confusion, it would be better, 

 in the case of Rosae, Salices, etc., to affix the label to the plant. 



c. Several specimens of each plant should be sent. Single specimens 

 are of very little use. 



d. It is particularly requested that good specimens should be sent. 

 Scraps are not of the slightest use . 



. e. No plants must be sent which are not included in the List of 

 Desiderata for the current year, unless new to the County or Vice-County in 

 which gathered. 



/. Each member must let the Distributor have a London Catalogue of 

 British Plants with a horizontal stroke (thus—) before each of his desiderata ; 

 which may be cancelled by a perpendicular stroke (thus -}-) when the plant is 

 no longer wanted. These Catalogues should accompany the parcels. They 

 will be returned in the return parcels. No MS. lists to be sent. 



g. The plants in the parcels should be arranged in the order in which 

 they are printed in the 8th ed. of the London Catalogue. Specimens of the 

 same species should be put on separate sheets in one cover, with the name of 

 the genus and species, and its number in the London Catalogue, written on 

 the outside of the cover. These covers should all be of uniform size. 



4. Members will very much increase the scope and work of the club if 

 they will send for examination any Batrachian Ranunculi, Rosae, Rubi, 

 Callitriche, Hieracia, Menthse, Salices, Naiadaceae, Junci, Carices, Characeas, 

 &c., — the study of critical species being one of the principal aims of the 

 club. One specimen of each will be returned to the owner after examination. 



In the case of Hieracia the colour of the styles should always be stated on 

 the label. 



The following quotation from Prof. Babington's British Rubi" will 

 show what a perfectly diagnosable specimen of a fruticose Rubus should con- 

 ,sist of. — "To judge properly of a bramble from a preserved specimen we require 

 a piece of the middle of the stem with more than one leaf j the base and tip 

 of the stem are also desirable. Likewise a piece of the old stem with the 

 flowering shoot attached to it ; the panicle with flowers, and the fruit. We 

 likewise want to know the direction of the stem throughout, of the leaflets, 

 and of the calyx ; also the shape of the petals and the colour of the styles ; a 

 note of these should be made when the specimen is gathered." 



