-9 - 
AX though » great mnj object# were seen to be brought to 
the fleet# at one tie# or another ( including piece# of board, 
string, feather# end even wire netting) by f u r the greatest 
part of the neat ssa terlat eons Is ted or seaweed* Strand* of 
Laminaria were ®ueh need mid #© were branched fttldlil* Both 
ty ee Might be collect®'! in on® bout during which the bird 
visited on® particular area of ##a but they did not seen to be 
acted ftt re m. For in Le a bird t ■ e five trio* 
in MSfiifiei, #ach tine bringing in etalkc of L&win&rla, 
hen three more brim- if fuc t# f t let or eoriee 
of Laminaria. It #ee«ed the t this tendency in stick to one 
tyre of material for several trip* sight be due to tie fact 
| the bird wee making #ev#i *uea##aiv# visits to rat r.er 
* is* 11 region# of the sea-floor where, perhaps, only on# type 
nr the other wee available* However this tendency far a run on 
one type of note rial wo# observed or® » when the c lasting »m 
changed considerably. Only by observing rsmy tripe and noting 
mo for *• islble not only what type of Material a# .collect#' 
• but ftl«o in# area where the bird dived mould it be #h n (1) that 
there really were M on one type of water ft aber of 
trios < ;«a In tno .-f-ateriri brought did not 
coincide with change# in the Ufltt area* ben both the## 
point# wet esial Lished beyond the .11 ty of . i i r occurring 
o aneeit mould be ©oncPppppi lit the bird# seeded definitely 
to be chewing one type of Material on a number of trips and then 
ir to / , the sight ®- r type of 
material on the # eft-fin or nay mt .ent for a nett 
L 
c'-v -pop i p her it a# he #* rci. 
C 'P - i ■ f 
lft«t# for several trip®. i . -viiP: p.;p "i.pp- 
i /" ;i '' V PS O ’ ’ P : 'ft- P-m 1 - fpp? ■■■■ : ■■ ' ; P v viPP-.il ■ ' V i PP^ 
jaye when several different type# of toot are svailsbl®. The 
More general conce t of ati&ulu# expects tic ; seen# to be acre 
acre, in use in theories of behaviour# 
To speak of a searching iMftg# 1 # of course only e convenient 
way of describing wb ibe# red. It cannot suggest the re*#en 
for the behavioiir. There in m evidence that 1 ccul .1 e ® & that 
the two types Material were used in di f event part # of the 
nests ( contra# t the k 1 tit wake ) * Indeed the fit© old© seemed 
altogether better for when they dried the tangle! strand# 
a three-dimensional »e#h which wade the 
'pi ! the Le«in$ri« stalks r leave# 
never int# -;eked ft© well ® - ften #11 pied off ie no 3 i before 
pp ®y had Use to dry. Thu# 4 :>ugh I failed to tn^rs^al 
i:,c use of the two e# of Materiel - no ccilcetln. jhaviour 
* could be use to 'throw light ther problem, P ' p : t-ip : y 
in which the #hsg# search for am# t sal® rial# 
The bringing of material to the ledge is only ih© 
first -part of neat building. The main growth of the nest is 
due to the Mere acettwulaUon of nest Material where it is 
dropped but there la a very characteristic movement which certainly 
