The cavalcade of flowers in the London parks, in their unending procession of colours, from crocuses of early spring to dahlias of late summer, has won international fame, and this evening Mr. C. H. Middleton is bringing to the microphone the man to whom the credit is due. Through the medium of the London parks, Mr. T. Hay, Superintendent of the Royal Parks, is constantly introducing new and interesting flowers to the public. And he is to discuss some of the novelties that he recommends for this year's gardens.