PORTRAIT OF PROFESSOR HARVEY. 



It was the intention of the PubHsher to have prefaced this vohime 

 with a portrait of the Author. The Author's absence in the New 

 World prevents this imtil his return, which is not expected before 

 Midsummer, 1850. As soon after tliis time as the engraving can 

 be finished, the Publisher will dehver the print, free of charge, in 

 exchange for this notice, which pm'chasers of the work are solicited 

 to sign and present, either direct, or through then- respective Book- 

 sellers. 



John Van Voorst. 



Paternoster Row, London, 



December 20, 1849. 



that in one, what is called the odd segment of the calyx 

 is posterior, while in the other it is anterior; and till this 



