72 Tue Ottawa NATURALIST. [June 
littoralis, Mitchell) have been taken, and unprecedentedly vast 
schools of Picked Dog-fish or Bone-dogs (Sgualus acanthias, 
Linn.) have infested the whole of our: Atlantic coast from Gaspé 
southward. Can it be that our eastern shores are undergoing 
some change rendering the sea warmer and more attractive to 
these fishes which usually prefer more southerly habitats? The - 
distribution of species is a most fascinating study and one to _ 
which our local zoologists might profitably devote more attention 
in the future. 
E. E. PRINCE. 
ANDREW HALKETT, 
W. S. ODELL. 
CORRESPONDENCE. 
The Editor OtTrawa NATURALIST. 
S1ir,—I am making a special study ot the Carices (sedges) of 
Ontario, and should be very grateful for the co-operation of all 
Ontario botanists. ; 
It would greatly advance our knowledge, if everybody at all 
interested in plants would collect all the sedges they come across 
this summer and fall. They should collect the whole plant, roots” 
and all in duplicate, place a label bearing a number, the locality, 
date of collection and collector’s name in each paper, and press for 
about four days. This is all the drying sedges need. 
At the end of the season mail one lot of duplicates to me (flat, 
not rolled) marked ‘‘ Sample Post.”’ I shall be glad to refund, the 
postage and will, upon determining the specimens, send a list of the 
numbers with the name of the species against them. 
One important point to be borne in mind about sedges is that 
they must be collected in full fruit, that is, when the achene (seed) 
is fully formed and hardening. 3 
All specimens received will be fully credited to their collector 
in anything I publish on them. 
Yours truly, 
A. B. KiuaGu. 
Guelph, Ont. 
