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Abstract

As a short preface to this article we feel it is appropriate to quote, briefly, from a passage in Cajal’S autobiography (1937). He writes: “The complexity of the insect retina is something stupendous, disconcerting and without precedent in other animals. When one considers the inextricable thicket of the compound eye ….. when one discovers not one chiasma as in vertebrates but three chiasmas of enigmatic significance besides the inexhaustible supply of amacrine cells and centrifugal fibres; when one meditates, finally, on the infinite number and exquisite adjustment of all these histological factors, so delicate that the highest power of the microscope hardly brings them under observation, one is completely overwhelmed”.