THE WARMER TEMPERATE ZONE. 135 



minded that, " without full series of specimens from many 

 localities/' differing varieties of a plant cannot be recognized 

 as members of one species ; and as an example of the wide 

 sense in which these words are to be taken, the instance of 

 one particular Pern may be named, Loma/ria procera, the 

 different appearances of which Dr. Hooker tells us he could 

 not understand by studying them in New Zealand alone, 

 nor until he had examined those of Australia, South Africa, 

 and South America as well. The inspection of a large and 

 correctly named herbarium, is also mentioned as a mode in 

 which the dispersion of species may be profitably studied. 

 This is a long digression, but an excusable one, both on ac- 

 count of the importance of the subject, and from the cir- 

 cumstance of its first having been put forward in connection 

 with the flora of New Zealand. 



The proportion of different kinds of trees in that country 

 to other plants is immensely greater than in England. The 

 vegetation is further described as of so peculiar a nature, 

 that more than two-thirds of the whole flora are unknown 

 in any other country. To form any idea of its character 

 therefore, with no English types to point to, would be simply 

 impossible by means of mere description. 



Of the two-thirds above mentioned as peculiar to New 



