Of course the kind and amount of imagery depend upon the imaginal type to which the spectator belongs and the wealth of the imaginal furnishing of his mind.
Can you suggest methods for the determination of imaginal type?
Lastly, some imaginal complex may intervene; but even so it need not be auditory; the observer may picture a printed score or the piano keyboard, or may feel himself striking a note which is a semitone above or below another.
The study of imaginal type, in relation to the interests and achievement of its possessor, thus offers an inviting field of work.
But if we leave the abstract idea out of the question, and consider the history of ideas, in minds of the imaginal type, then the composite photograph has more to say for itself.
You will perhaps get at the heart of the matter most easily if we lay down, at once, the general principle that no imaginalprocess or complex of imaginal processes is in its own right a memory-idea.
The sound comes to us as the sound of the piano, the instrument of that familiar look; and we may have an imaginal hint of the child playing, of the score, of its special difficulties, of all sorts of related things.
We should start out with our pattern of sensory nucleus, imaginal context, and brain-habit; and we should push our analysis back and back, in the effort to reach the primary and ultimate form of the perception we were discussing.
We have now to ask, first, about the terms in which thought goes on; and we shall find that it may go on in imaginal complexes, in words, and in mental attitudes.
Similar imaginal discs give rise during the later larval periods to the wings, etc.
These imaginal discs are simple masses of apparently indifferent cells, which for the most part appear at the close of embryonic life, and are attached to nerves or tracheae.
The formation of an independent skin within the first larval form in the Distomeae and in the Cestoda may be compared to the apparently independent formation of the imaginal discs in Musca.
There are a pair of cephalic imaginaldiscs and six pairs of thoracic discs.
The wings are formed from the two posterior dorsal imaginal discs.
These imaginal discs are in Corethra simply invaginations of the epidermis.
The "imaginal disks" or rudimentary portions destined to develop and form the skin of the adult, or imago, arise in the pupa state, which resembles that of other ichneumons.
An especially striking case of incongruence is offered by the family Notodontidæ, under which Boisduval, depending only on imaginal characters, united genera of which the larvæ differed to a very great extent.
How can the fact be explained that larval and imaginal families by no means always coincide; or that the larvæ can only be formed into families whilst the imagines partly form sharply defined groups of a higher order?
If new characters have a general tendency to become transferred to the younger ontogenetic stages, why are not new imaginal characters first transferred to the pupa, and finally to the larva?
Now when we see that two species which differ in their imaginal characters present correspondingly small differences in their larvæ, this exact systematic congruence indicates a completely parallel phyletic development.
Prorsa-Levana), which, like the genus Pyrameis, is entirely based on imaginal characters.
Here there can be no doubt that in an overwhelmingly large majority of cases the phyletic development has proceeded with very close parallelism in both stages; larval and imaginal families agree almost completely.
If the larva of a species has become split up into two local forms, but not the imago, each of the two larval forms possesses only the rank of a variety, whilst the imaginal form has the value of a species.
We need only to observe the influence of imaginal movements on powerful minds in order to see clearly what influence even their weak reflection may have on ordinary people.
The perception is correct when made, then the imagination causes movements of ideas and the question follows which of the two was more vigorous, the perceptive or the imaginal activity?
Discota: insects in which development of the adults is from imaginal discs: see adiscota.
Imaginal buds, cells, or discs: in forms with a complete metamorphosis are those embryonic cells around and from which the organs and appendages of the future imago develop.
Front region of Maggot of Blow-fly (Calliphora) showing diagrammatically the imaginal discs, which are shaded.
Hence we understand that the amputation of the latter by the old naturalists truncated only and did not destroy the imaginal limb.
The sub-imaginal instar of the may-fly furnishes also a noteworthy fact for comparison with other insect histories.
A curious segmental displacement of the imaginal discs with regard to the larva is noticeable in some Diptera.
Kowalevsky (1887) has shown that these replacing cells are aggregated in little masses scattered at different points along the stomach and thus corresponding rather closely to the imaginal discs of the legs and wings.
Not until spring is the pupal form assumed, and then it quickly passes into the imaginal state.
Not always however is it the imaginal stage of the life-history which is shortened.
Psychologically described, the sound induced an imaginal complex equivalent to the earlier painful experience.
No unprejudiced psychologist would be likely to interpret the activities of the orang utan in the box-stacking experiment as other than imaginal or ideational.
A considerable number of Lepidoptera take no food in the imaginal state; in these the maxillae are reduced or altogether atrophied.
The maxillae of the Lasiocampidae are so reduced that no food is taken in the imaginal state, and in correlation with this condition the feelers of the male are strongly (those of the female more feebly) bipectinated.
In such insects there is a complete "division of labour" between the larval and the imaginal instars, the former being entirely devoted to nutritive, the latter to reproductive functions.
Often the feelers are excessively complex in male moths whose maxillae are so reduced that they take no food in the imaginal state.
The number of imaginal disks in an individual is large, upwards of sixty having been discovered to take part in the formation of the outer body of a fly.
The imaginal disks for the outer wall of the body, some of them, at any rate, include mesodermal rudiments (from which the muscles are developed) as well as hypodermis.
Generally the larval is the feeding, the imaginal the breeding, stage of the life-cycle.
These centres of renovation are called imaginal disks or folds.
In other insects the imaginal disks are less completely disconnected from the superficies of the larval hypodermis, and may indeed be merely patches thereof.
Diagram showing position ofimaginal buds in larva of fly.
In cold and temperate latitudes a great majority of insects pass the winter in a dormant state, either in the larval, pupal or imaginal (reproductive) stages.
This connexion was not at first recognized and the true nature of imaginal disks was not at first perceived, even by Weismann, to whom their discovery in Diptera is due.
Sharp, is unlikely to be superseded by the result of any researches into minute imaginal structure.
The imaginal disks make their appearance (that is, have been first detected) at very different epochs in the life; their absolute origin has been but little investigated.
Calliphora vomitoria) the imaginal disks are to all appearance completely separated from the hypodermis, with which they are, however, really organically connected by strings or pedicels.
By far the majority of varieties are either simply imaginal or merely larval varieties--only the one stage diverges, the other is quite constant.
These larval groups would agree with those founded on the form-relationships of the imagines, but unlike the imaginal groups, which can be formed into families, they would scarcely possess a generic value.
This is especially striking in the genus Deilephila, eight species of which are allied in the imaginal state in a remarkable degree, whilst the larvæ differ greatly from one another in colour, and to as great an extent in marking.
As the caterpillars approach the chrysalis period these imaginal buds rapidly develop into the various organs of the butterfly.
I have omitted the lengthening of imaginal life which is due to hybernation in certain species.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "imaginal" in a variety of sentences. We hope that you will now be able to make sentences using this word.
