Since the publication of the Icones Muscorum, in tlie 

 year 1864, the lamented author made careful studies and 

 sketches of the copious new materials as thej came to 

 his hands, with a view to a continuation. A portion of 

 these was selected for the first Supplement, and the draw- 

 ings and engravings of these eighty-three plates were 

 completed before his death, in April, 1873. The draw- 

 ings were made under his immediate superintendence by 

 the sanie meritorious draughtsman who executed those 

 of the original volume, Mr. August Schrader, and they 

 were engraved on copper by Mr. William Dougal. 



Some progress had been made in the preparation of 

 the letter-press, but only a small portion of it was found 

 to be in readiness for the printer. Its preparation and 

 completion, as well as the oversight of the press, have 

 devolved upon his friend and intimate companion in 

 Bryological studies, Mr. Leu Lesquereux, to whom this 

 has been a labor of love and the paying of a tribute of 

 affection to an endeared memory. Inasmuch as he had to 

 draw up a large proportion of the following descriptions 

 from mere notes and remarks appended to the specimens 

 in the Herbarium, it would have been only just, no less 

 to Mr. SuUivant than to Mr. Lesquereux, that the name 

 of the latter should be placed upon the title-page as the 

 editor of this posthumous work. But he has strenuously 

 objected to this, and his decided wishes have been de- 

 ferred to. Regarding the incomparable "Icones" and this 

 Supplement as a fitting memorial of one who will rightly 

 be remembered as the father of American bryology, he 



288ir> 



