|Alternative reference number||NLB/45 p390|
|Title||Copy letter from Robert William Frederick Harrison to Dr J S Haldane FRS, Cherwell, Oxford|
|Date||19 April 1912|
With reference to your note of April 115th, the time available for the demonstration in the Meeting Room would be twenty minutes to half an hour. Experience has shown that a longer interval than half an hour for "lecturettes" is inconvenient.'