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P.J.A. Timmermans and E. Maris

that (moreover) swims in a synchronised and polarised way. It is quite common for young fishes to live in schools. In many species schooling is abandoned later in life; and some species become territorial. Living in groups is not intrinsically incompatible with hunting. Perch (Perca fluviatilis), for

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Nance Vodegel

those in the forensic psychiatric field, are working in often very stressful conditions. And they are therefore mostly not very motivated to cooperate with research workers when they have the feeling that such a cooperation only means a contribu- tion to work overload. And even if they can be convinced

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M.J. Sommeijer, D. Koedam and I. Aguilar Monge

not the only factor that makes gynes vulnerable to attacks or that motivates workers for attacking them. The final day of a gyne's life was generally characterised by the same type of aggressive worker behaviour as in the days before. At that time however, it was more intense and severe. Furthermore

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A. Kortlandt

to think in neurological concepts throughout his life (SPEHLMANN 1953). Moreover, FREUD was "above all a biologist" as was recently stated by RÜMKE, President of the World Federation for Mental Health, in his com- memorative speech at the unveiling of the FREUD memorial in Vienna. 163 were

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E.F. Jacobi

-by but the two swans never became the hoped for breeding pair. Another difficulty is to provide suitable surroundings for breeding. With the hoofed animals living in herds there are no difficulties in general. If there is room enough nothing has to be arranged. With only a restricted place it has proved

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A.A. Mabelis

were removed weekly and replaced by living individuals from the mother nest. The added queens, unlike the workers, were not accepted and were found dead in a corner of the foraging area on the following day. When the populations were put on a special diet, each nest had 521 about 1000 workers and

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P.J. Den Boer

species as a rule do not exclude each other, either because they do not compete or because other "factors" are apparently more important than a possible interference, up to now I was not highly motivated to devote a paper to this subject, because "the principle" is gradually disappearing now from the

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centres bulls are restrained for a time even after protrusion, combined sometimes with one or more false mounts prior to service. These differences in methods are motivated primarily by intuition. Studies bearing on the efficacy of these different procedures are meagre and conflicting (BAKER 1954, BRANTON

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K. VAN ZEGEREN

restricted to certain seasons especially where the mice are actually living in buildings. The composition of the population can be seen as an expression of this strategy. The basic structural units are demes, units with a discrete life span, a large reproductive output, and a certain degree of repro- ductive

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J.F.W. Nuboer

compromises. For instance, a living object (e.g. animal, egg or fruit) has a protective col- ouring that matches the average colour and luminance of the sur- roundings as seen by prey or predator, or its shape is masked by means of obvious random contrasts. Other forms of camouflage are countershading, i. e