Once one would, In this way, movement by movement, have found the 
origins, it becomes of great importance to list exactly in what way 
the movement has changed in the courseof radiation, because that 
will give us ideas as to what can change in speciation, in the way 
of behavior mechanisms. 
And all this seems to me to lead to so many intersting aspects, 
of evolution, taxonomy, behavior, that it will be a major Job to 
work all this out. Publication of all the descriptive stuff may be 
difficult, and it may be necessary to keep the full reports as mimoe 
graphed reports, andperhaps publish short descriptive accounts in 
various journals (if you could do this in papers isazai of a size 
acc p table to various ornithological Journals, you might get them 
published with at least the drawings in such journals as Wilson 
Bulletin, Conddr, Ardea eta (Ardea might accept a paper on a species 
that occurs in the West Indies)), and then general conclusions in 
Behaviour journals. 
Another point: what cb you think of wing tip patterns? I got the 
idea that they must be rather adaptive, inclusive perhaps mantle- 
color and color of under wing. It struck me that H a rtlaub's gull 
has got the white front bar on the upper wide of the wing Just as 
ridibundus and Bonaparte* s, but that H a rtlaub's has developed a 
rather canus-like wing tip pattern. Now it may be significant that 
at least in South Africa there is no other species that has the argen- 
tatus or canus-type; it is as if, for species-recognition, the species 
in each general region diverge. Usually, when the field ornitholo- 
gist uses such a thing as a field character for diagnosis, ( as in 
the wing and tail patterns of waders), it seems as if the birds 
themselves use it too. If so, Dwight would have taken a rather aw- 
kward character to base his classification on. But I can't see any 
practicable way of deciding whether these things are social signals 
or not, except perhaps: a. zoo observations in which species from 
all over the world would respond to flying species with similar 
wing patterns (as with the Geese in the Berlin Zoo), b. statistics 
about the wing patterns of species within one geographical area. 
With al5- these things, I may be talking wet, Just knowing so much 
less than you do. I wish we could have another gull conference with 
you attending and showing your stuff. Whenever you would come to 
Europe, you need only tell us and we would all converge on whatever 
roost you would choose to alight l 
I guess you are well informed about new developments in Oxford? 
Desmond got a job in the London Zoo, Aubrey a lectureship in Edinburgh, 
IJli same in Birkbeck college, Fae a fellowship in California, D a vid 
Blest a lectureship in University College. That looks like spreading 
the gospel indeed. 
Our stay here is very pleasant and s ilating. I feel quite at home 
as usual, and there vis a lot to see the surroundings. We are ex- 
tremely lucky with the weather, and marvel at the Cascades, the 
Olympics, the bird islands in the sound, and the giant volcanoes. 
Just last weekend I slept In a large glaucous-winged colony and 
could, start watching from mytent at daybreak; saw all the displays 
many times, and could even take some pictures. 
All the best, yrs ever 
