The WATSON 



Botanical Exchange Club, 



REPORT FOR 1899-1900. 



It is satisfactory to be able to record an increase in the 

 number and an improvement in quality of the plants 

 contributed. The total number sent in (by twenty members) 

 was 1,682, and the plants were, with few exceptions, carefully 

 selected and dried. 



The appearance amongst the material contributed of two 

 plants new to science, a Ruhus and a Potainogetoii, is noted in 

 the present Report at p. 9 and p. 21. 



It would add greatly to the value of alien species if the 

 collectors of these gave (on- one label) information as to the 

 degree of naturalization, probable means of introduction, &c. 



In the case of Callitriche and Cevatophylliim it must be 

 remernbered that it is necessary to collect fruiting specimens. 



