34 Rhodora [ Marcu 
Attention of correspondents is especially drawn to the fact that only 
such additions and changes are here presented as can be made with 
confidence and definiteness. Some valued notes have been received, 
which involve nice questions of judgment and consequently require 
further study before it is possible to express any confident opinion in 
regard to them. It is hoped that these matters may receive satisfac- 
tory solution and be duly recorded later. Such for instance are 
extensions of range where a slight doubt of identity is involved. 
Regarding the corrections here brought together, it may be stated 
that the rather numerous cases in which generic names have lost their 
accents in the final impression of the Manual are due to a technical 
difficulty in the printing, these names having been in nearly all cases 
properly accented on the proofs. The insertion of many pre-Linnaean 
authorities not recorded in the Manual is here made in order to give a 
fair degree of uniformity in this rather difficult matter. The use of 
these bracketed authorities, though it has become customary in many 
scholarly works such as the Index Kewensis, Dalla Torre & Harms's 
Genera Siphonogamarum, etc., is a matter of sentiment rather than a 
scientific necessity. It is furthermore very difficult to carry out this 
practice with entire consistency. To attain some measure of uni- 
formity in the matter, it has seemed best to employ these pre-Linnaean 
authorities only in cases where the earlier use of the name was at 
least partially in accord with the Linnaean and post-Linnaean appli- 
cation and in the second place not to attempt to carry these authorities 
back of the beginning of the 18th century. The publication of 
Tournefort’s Institutiones in 1700, soon followed by the notable 
generic works of Rivinius, Ruppius, Dillenius, Vaillant, and some 
others, introduced a new epoch in plant-classification which for genera 
is almost as noteworthy as 1753 has become for species through the 
publication of Linnaeus's Species Plantarum. 
The writers gratefully acknowledge aid from the collectors and 
other correspondents, who have kindly furnished many of the facts 
briefly recorded in the following emendations. Special assistance 
has been received from Dr. G. G. Kennedy and Dr. A. S. Pease, 
who have furnished lists of omitted accents and given scholarly aid in 
determining doubtful cases in the accentuation of the scientific names. 
Mr. B. F. Bush of Courtney, Missouri, has contributed an especially 
long and helpful list of extended ranges of plants growing in his state. 
Further notes and corrections of a similar kind may at any time be 
