APPENDIX B. 133 



^ C Two stamens longer Didynamia (14.) 



( Stamens equal Tetrandria (4.) 



/'Stamens 3 Triandria (3.) 



16 ^Stamens 2 Diandria (2.) 



l-Stamensl Monandria(l.) 



The above form is given in preference to a 

 mere enumeration of the Linnaean Classes as 

 being more useful and instructive. It will at 

 once be perceived that if it is wished to know 

 what class any plant belongs to, we must in the 

 first instance observe whether it has stamens or 

 pistils, if it has neither, it is one of the Crypto- 

 gamia, and our point is ascertained at once. If 

 it have stamens .and pistils we are referred to 

 No. 2, and, accordingly, as the stamens and 

 pistils are, or are not, on the same flower, we 

 are to turn to No. 3 or 4, and so on till we have 

 completed our search. Such an analysis is of 

 great practical utility. The number of each 

 class in Linnaeus' arrangement, is given at the 

 end of each in a parenthesis. 



C. 



AT the end of a chapter on the longevity of 

 trees, in which M. De Candolle fully shows 

 his grounds for concluding their ages to be 

 what he has stated, he gives the following table 

 of some of the most remarkable in the world. 



