Dear Dr, Siagal, Thank you very moh for your letter, and fox the T,#,V, solution, which arriwrd tsafrsly, X shall be very intersated to 888 whether thars ts my deteatabla differencse between this and the etra&n whioh X had frorn Dr, Pirig and 1 shall czertafnly let ysu know as Boon a8 1[ have my redte, First I must try to obtain from your apfm%men a birefringent %ottom layer* solution, a6 it is only from &uoh a solution that X am cabls to prepare well-orfentatrwl, spmfmena, layer@ eolut ion) e and wait lpQBt ini;ru;.estad in all that you told me about your work. ("ha slaterial axrfvad in the fozlos of %op Z very muah enjoJFarcf my vlsft to your laboratosy,