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to be : the technique is not diffi-

/uli if appliances for high vacua are available.

1 am to be to this opportunity of ex-

pressing my to Mr. F. \V. Aston, B.A., and

Mr* E. My thanks also are due to the

Council of the Royal Society for per-
to use the Illustrating my Bakerian

Lecture.

J. J. THOMSON.

4 1915.



	v: to be : the technique is not diffi- /uli if appliances for high vacua are available. 1 am to be to this opportunity of ex- pressing my to Mr. F. \V. Aston, B.A., and Mr* E. My thanks also are due to the Council of the Royal Society for per- to use the Illustrating my Bakerian Lecture. J. J. THOMSON. 4 1915.