SUMMAKY OF THE CONTENTS OF VOL. II. 333 



equal; whilst we know that certain well-explored districts in 

 Europe have more than three times as many insects as phseno- 

 gamous plants . . 113 119 



Considerations on the probable proportion which the number of known 

 phsenogamous plants bears to the entire number existing on the 

 surface of the globe . . . . . . 119125 



The different forms of plants successively noticed. Physiognomy of 

 plants treated in a threefold manner ; viz. as to the absolute di- 

 versity of forms, their local predominance in comparison with the 

 entire number of species in different phaenogamous Floras, and 

 their geographical climatic distribution . . . 126 200 



Greatest extension in height or of the longitudinal axis in arborescent 

 vegetation : examples of 235 to 245 English fefit in Pinus lamber- 

 tiana and P. douglasii ; of 266 English feet in P. strobus ; of 298 and 

 300 English feet in Sequoia gigantea and Pinus trigona. All these 

 examples are from the north-west part of the New Continent. 

 Araucaria excelsa of Norfolk Island only attains, according to 

 well-assured measurements, 203 to 223 English feet; and the 

 Mountain Palm of the Cordilleras, Ceroxylon andicola, 192 English 

 feet . 165168 



These gigantic vegetable forms contrasted with the stem of two 

 inches high of a willow-tree Stunted by cold of latitude or of moun- 

 tain elevation; and still more remarkably with a phsenogamous 

 plant, Tristicha hypnoides, which, when fully developed in the plains 

 of a tropical country, is only a quarter of an English inch in 

 height ' 169 



Bursting forth of blossoms from the rough bark of the Crescentia 

 cujete, the Gustavia augusta, and the roots of the Cacao tree. 

 The largest flowers, Eamesia arnoldi, Aristolochia cordata, Mag- 



