APPENDIX II 481 



subscription per annum is required, and each member is 

 expected to contribute a parcel of plants each year, in 

 return for which he or she receives a parcel of plants 

 collected by other members, often amounting to one 

 hundred of the rarer species. In addition reports are 

 published giving valuable notes upon specimens collected 

 or sent in for identification. There are some continental 

 exchange media also, and dealers will supply foreign 

 specimens of rare British species at a reasonable figure. 

 Exsiccata or sets of plants are sometimes issued here and 

 abroad, and these are also valuable aids to a knowledge 

 of critical genera. A set of Rubi has been published by 

 the Rev. W. M. Rogers, and a set of Hieracia by the 

 Rev. E. F. Linton. 



Access can be had to the large and valuable herbaria at 

 the National Museum, and at Kew, and the authorities in 

 charge give every facility for the study of material (British 

 and foreign) under their charge, and besides are most ready 

 to give any information that is desired, each member being 

 a specialist. The same applies to the herbaria at Oxford, 

 Cambridge, Edinburgh, Dublin, where valuable collections 

 of recent or classic origin are preserved. The Linnean 

 Society also possesses the Linnean Herbarium, which is of 

 priceless value for an understanding of Linnean species. 



There are also at Kew, Oxford, Cambridge, Edinburgh, 

 and elsewhere botanic gardens where British or foreign 

 types of plants are grown and where their living characters 

 can be studied, in season, on the spot. Similar facilities, 

 as in the case of the herbaria, are held out to anyone who 

 wishes to study living plants, and the staffs will also take 

 trouble to identify undetermined material. 



The value of making one's own culture experiments of 

 British plants is shown by the work of Hanbury on 

 Hieracia, and of Linton on Hieracia and Willows, to 



VOL. III. 3 I 



