The following paper on the Mosses of Alaska, by J. Cardot and I. 

 Th^riot, was originally published in the Proceedings of the Washing- 

 ton Academy of Sciences, vol. iv, pp. 293-372, July 31, 1902. It is 

 here reprinted from the same electrotype plates, so that it may be 

 quoted exactly as if it were the original. The original pagination has 

 been preserved and transferred to the inner or hinge side of the page, 

 where it is enclosed in brackets, thus [294] ; while the consecutive 

 pagination of the present volume has been added in the usual place. 

 In the plates the original numbers and running headline, slightly 

 abbreviated, have been preserved [in brackets], while the volume 

 designation and serial plate numbers have been added in the usual 

 place. The original text references to the plates are unchanged. The 

 present headpiece and title have been substituted for the running head- 

 ing of the Academy's Proceedings and the original title, which was : 

 Papers from the Harriman Alaska Expedition, xxix. The 

 Mosses of Alaska. No other alterations have been made. 



The authors desire to record the following corrections : 



Page 255 [295] : 



Second line from bottom, for polycarpam read polycarpum. 

 Page 278 [318]: 



Eleventh line from bottom, omit ' pi. vin, fig. I.' 



Eighth line from bottom, omit 'pi. vin, fig. 2.' 



Fourth line from bottom, omit 'pi. V, fig. 3.' 



Page 288 [328], seventh line from bottom, for ' Barclay' read Boulay. 

 Page 303 [343]: 



Omit line of synonymy under ' Hypnum sarmentosum beringianum.' 



Seventh line from bottom, omit ' in litt.' 



Omit line of synonymy under section 'Calliergidium.' 

 The following species should be added to those contained in the paper : 



CEdipodium griffithsianum Schwgr., a species not heretofore recorded as 

 American, is added by Mrs. E. G. Britton, from Kadiak (Trelease, 1416). 



EDITOR. 



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