RULES. 



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 the critical genera. 



2. The subscription is 5s. a year, and is due on January 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 or sheet of plants must bear a label giving the name, place 

 where collected, collector's name, and date. The labels should not be attached to 

 the specimens nor to the sheets. 



c. At least s/;tr specimens of each plant should be sent. Single specimens 

 are for record only, not for distribution. 



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. list should be sent. 



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

 ■ are printed in the gth ed. of the London Catalogue. Specimens of the same species 



should be put on separate sheets in one cover, each sheet being accompanied by one 

 label, with the name of the genus and species, and it.s number in the London Catalogue, 

 written on the outside of the cover. These covers should all be of uniform size ; from 

 10 to 12 by 16 to 18 inches is recommended. Very large sheets are more objectionable 

 than very small ones. 



h. The covers should be made up in a parcel enclosed by two stiff 

 cardboards. Each board should bear the owner's name for use in the return parcels. 

 Small boards are as objectionable as large sheets, because they cannot be used for 

 return parcels. 



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

 will send for examination any Batrachian Ranunculi, Ros«, Rubi, Callitriche, 

 Hieracia, Menthse, Salices, Naiadaceae, Junci, Carices, Characese, &c., — the study 

 of critical species being one of the principal aims of the Club. One specimen of 

 each will if possible 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 fi'uit. 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." 



