MR. T. SOUTHWELL ON MIGRATION OTHER THAN OF BIRDS. 15 
I. 
ON MIGRATION OTHER THAN OF BIRDS, WITH 
SPECIAL REFERENCE TO THE CETACEA. 
Bv Thomas Southwell, F.Z.S., V.-P. 
Read 26 th April , 1904. 
The study of the group of phenomena associated with 
migration, for the observation of which we, in this the most 
easterly extension of the British Isles, are so favourably 
situated, has from the earliest times attracted the attention 
of thoughtful observers ; but it is only within the exper- 
ience of many now living’ that.jhey have been studied by 
scientific methods, an^l till recently the observations have 
been almost entirely restricted to the arrival and departure 
of birds. The equally interesting movements of the maiine 
mammals and fishes frequenting the waters which lave our 
shores have attracted very little notice further than that 
evinced by the fishermen who have regular seasons for their 
capture. “ Calendars ” recording the arrival and departure 
of birds and other kindred natural phenomena have been 
compiled without number ; by far the most remarkable of 
which is that kept for the last one hundred and seventy 
years by the Marsham family in our own neighbourhood ; 
but I venture to think they are more curious than useful — 
something far more comprehensive is required to constitute 
records of any material value, and I think I shall be able 
to show, although I may have to travel further afield 
than our own immediate neighbourhood, that avine migration 
is not the only branch of this difficult subject which is 
worthy of our study. 
The first really useful step in the right direction was taken 
