96 The Plant World. 



and cutinized, while the cellulose cell walls will be yellow or of a 

 brownish-yellow color. 



Specimens bleached and cleared in the manner just outlined, 

 may be readily stained by any of the general methods of stain- 

 ing, and mounted in Canada balsam or any other medium at 

 hand; but no method surpasses the one just outlined for the treat- 

 ment of leaves and stems, when a detailed study of their cell 

 walls is desired. With this treatment, every detail of structure 

 such as pits and primary cell walls stands out boldly. In the 

 preparation of specimens for lantern projection, camera lucida 

 drawings and for making photomicrographs, it is to be highly 

 recommended. 



A NEW ROCKY MOUNTAIN BOTANY. * 



By H. M. Hall. 



Twenty-five years ago Professor John M. Coulter gave to 

 the botanical public his Manual of the Botany of the Rocky 

 Mountain Region. This has now been thoroughlv revised and 

 brought down to date by Professor Aven Nelson, of the Uni- 

 versity of Wyoming. Although Professor Coulter's work was 

 confessedly tentative, since it treated of a little-known district, 

 it has been of inestimable value, especially in that it has incited 

 many western plant lovers and botanists to look more critically 

 into their interesting flora. 



It should be remembered that a local or regional flora need 

 be neither absolutely complete, infallibly accurate, nor based 

 upon an extensive personal acquaintance with the plants them- 

 selves. Such complete works are, to be sure, greatlv to be de- 

 sired and may well serve as an ultimate aiai, but there is an im- 

 mediate call for tentative accounts based upon scattered publi- 

 cations and giving our present knowledge of the species treated, 

 together with artificial keys to aid in their determination. 

 Such compilations not only assist in making identifications but 

 encourage the gathering of materials and data for more critical 

 and exhaustive studies. 



If we look upon Professor Coulter's manual as a pioneer in 

 this field, we may consider this revised edition as marking a 



♦New Manual of Botany of the Central Rocky Mountains (vafcular plants), by 

 John M. Coulter, Ph. D., ProfesEO/ of Botany, the Univtrtily of Chictto, rcvittd by 

 Aven Nelson, Ph. D., Professor of Botany, the Lniversity of Wyoming. 646 pages. 

 ▲merican Book Company. 



