R XJ L E 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 2s. 6d. a year, and is used to defray 

 the expenses of printing, postage, &c. Any surplus is devoted 

 to increase the work of the club. 



3. a. Members may send to the Secretary, or 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. 



h. Each plant must bear a label giving the name, place 

 where collected, collector's name, and date. 



c. Several specimens of each plant should be sent, and 

 they should be good specimens. Scraps are not of ihe slightest use. 



d. No plants must be sent which are not included in the 

 list of Desiderata for the current year. 



e. Each member must let the Distributor have a London 

 Catalogue of British Plants with a mark against his desiderata. 

 These Catalogues should accompany the parcels. They will be 

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



f. It would greatly facilitate the work of distributing if the 

 plants in the parcels were arranged in the order in which they 

 are printed in the London Catalogue. 



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

 club if they will send for examination any Batrachian Ranunculi, 

 Rosae, Rubi, Callitriches, Hieracia, Menthas, Potamogetons, 

 Salices, Junci, Carices, Charas, &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 consist 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 ; 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." 



