4 Rhodora [JANUARY 
etc., in which there are many details closely related to the topic I am dis- 
cussing, he published (1900) a list of the marine algae of New England 
with distribution noted as to the shores of the different status. I quote 
from his introductory note, as follows:—" Massachusetts . . . is divid- 
ed into two parts, northern and southern, as the most strongly marked 
division line for algae on the whole Atlantic coast occurs here. As 
regards the marine flora, Nahant and Nantucket differ more from 
each other than the former does from Newfoundland, or the latter 
from Fortress Monroe. The division line is usually given as Cape Cod 
but as the flora of the inside of the lower cape is the same as that of 
Vineyard Sound, the latitude of Provincetown has been taken as the 
boundary.” For the preparation of this paper, Mr. Collins took the 
trouble to prepare an extended and annotated list, bringing the pub- 
lished list up to present date and adding notes as to habitat and 
localities for the majority of the species. It seems safe to assert that 
the flora of the coast of New England is better and more definitely 
known than that of any coast of similar extent and diversity, and that 
much of this is due to the efforts of Mr. Collins. I have, therefore, a 
feeling of the greatest confidence in undertaking the discussion of the 
geographical distribution of the marine flora of this coast as a model and 
precedent for similar discussions of the same problem for other and 
less known coasts. I desire, accordingly, to express here my sincere 
indebtedness to Mr. Collins for his generosity in turning over for my 
use of so much valuable data. 
Besides the publication of the “list,” Collins has called attention 
to some of the very definite and important warm spots to the north of 
Cape Cod, all of which have been either discovered or, at least, 
personally investigated by him. In 1908, Collins especially mentioned 
three distinct areas of warm spots, viz. . . . those about Quincy 
and Weymouth, Massachusetts, those about Gloucester, Massachu- 
setts, and those in the vicinity of Casco Day, Maine. He states that 
in early warm spring seasons, there are abundant southern forms in 
these warm spots, while in late cool seasons, southern forms are scarce. 
The biological survey of the waters in the vicinity of Woods Hole, 
Massachusetts, carried on by the U. S. Fish Commission under the 
direction of Francis B. Sumner and Bradley M. Davis during the 
years 1903-1905, have been published in excellent form for yielding 
the greatest assistance to the student of the geographical distribu- 
tion of the marine flora of New England. The report (1911) on this 
