140 THE BOOK OF EVERGREENS. 



arboriculturist to experiment and endeavor to ascertain 

 the requirements of these trees. 



This subject is of such importance that, having been fre- 

 quently misled ourselves, we desire to impress upon the 

 minds of others the necessity of understanding the meaning 

 of these terms ; and because a certain plant may not succeed 

 with us, it is no reason that it may not with a more for- 

 tunate neighbor, who has probably secured the condi- 

 tions necessary for its success. 



Among these so-called tender species, there may possibly 

 be some, especially those from the higher altitudes on the 

 mountains of Mexico, that may eventually succeed in the 

 warmer portions of the Middle States ; but in their gen- 

 eral usefulness we place but little confidence, as our ex- 

 tremely variable climate is so totally different from their 

 even, although cold, situations. 



As our knowledge of most of the newly discovered 

 Conifers is restricted entirely to the descriptions given by 

 various authors, and principally to those of English 

 writers, we do not feel willing to be held responsible for 

 mistakes in nomenclature, when noticing such plants. 

 Enthusiastic explorers are prone to the fault of renaming 

 old species, not through any desire to impose upon the 

 public, but in most instances by allowing their better judg- 

 ment to be set aside, for the purpose of receiving that 

 honor which is very justly bestowed upon the discoverer 

 of a new species ; and such we are compelled to believe is 

 the case in the new Mexican Pines of Roezl. This dis- 

 coverer has introduced the names of about 120 new species, 

 but which, according to the recent examinations of Gordon, 

 and others, has resulted in obtaining but five that are en- 

 tirely new and previously unclescribed. 



Those considered as good species are as follows : 



38. P, Lawsoni, Hoed. A medium-sized tree from 

 the higher mountains. 



