T here are m a n y re p o rte d o b servations of lum inescence on th e surface of th e M oon. T h e y fall in to tw o categories: sp ectro m etric a n d colorim etric. T he a u th o rs w ill show t h a t th e spectrom etric tech n iq u e is th e m ore a c cu rate a n d sensitive, b u t th a t b o th tech n iq u es ca n yield m isleading d a ta if th e m o st careful p recau tio n s a re o m itte d . D etails will be g iven o f sp e c tro m etric observatio n s o b tain ed over th e la s t few

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... ears a n d o f th e ir significance in elu cid atin g th e m echanism o f lum inescence.