asked the Minister of Supply whether he will give an assurance that he intends to make full use of alien scientists in this country, and particularly of Professor Weisenberger, who are anxious to place their knowledge at the disposal of the Government to intensify the war effort?

Certain friendly alien scientists are already employed by the Ministry of Supply. In view, however, of the highly secret nature of most of the work, it has not been thought desirable, as a general rule, to employ enemy alien scientists in the Ministry's research establishments, although exceptions are made in special circumstances. Perhaps my hon. Friend will kindly send me full particulars of Professor Weisenberger.