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CLASS XII. 

 ICOSANDRIA. 



" He that enlarges his curiosity after the works of Nature, demonstrably 



multiplies the inlets to happiness ; and, therefore, the younger part of my 

 readers, to whom I dedicate this vernal speculation, must excuse me for call-, 

 ing upon them, to make use at once of the spring of the year, and the spring 

 of life, to acquire, while their minds may be yet impressed with new images, 

 a love of innocent pleasures, and an ardour for useful knowledge ; and to re- 

 member, that a blighted spring makes a barren year, and that the vernal 

 flowers, however beautiful and gay, are only intended by Nature as prepara- 

 tives to autumnal fruits." Dr JOHNSON. 



I. MONOGYNIA. 



147. PRUNUS. Calyx inferior, 5-cleft ; petals 5 ; nut of the drupa 

 with slightly prominent seams. 



II. PENTAGYNIA. 



J48. MESPILUS. Calyx superior, 5-cleft; petals 5; apple with 

 2-5 bony single- valved capsules ; seeds 2. 



149. PYRUS. Calyx superior, 5-cleft; petals 5; apple with 2-5 



membranous 2 .valved capsules ; seeds 2. 



150. SPIRAEA. Calyx inferior, 5-eleft; petah 5; capmks of 2 



membranous valves ; seeds numerous. 



