Letter to Pontecorvo from the Right Honorable Earl of Halsbury in which he encourages Pontecorvo to apply for a patent for his work on Aspergillus and the parasexual cycle

Correspondence between Pontecorvo and the Right Honorable Earl of Halsbury concerning Pontecorvo's complaints against the National Research Development Corporation

Correspondence between Pontecorvo and the Right Honorable Earl of Halsbury concerning the National Research Development Corporation's decision not to sponsor further work in Pontecorvo's laboratory

Copy of a letter from Pontecorvo to the Right Honorable Earl of Halsbury discussing the completion of his collaboratory work with Dr Giuseppe Sermonti on applying their "discovered [recombination] technique" to Penicillium chrysogenum