  Using observations of the 2496.7 A B I line with the HST GHRS at a nominal
resolution of 90,000, we have found the abundance of boron of HD 140283 to be
log epsilon_B (= 12 + log (N_B/N_H)) = 0.34 \pm 0.20. This result is found when
a significant non-LTE effect in the formation of the B I line is taken into
account. The resulting N_B/N_Be ratio is about 17 (in the range 9 -- 34), which
is in very good agreement with what is expected from spallation by cosmic rays.
We conclude that this origin of Be and B in the Early Galaxy is the most
probable of recently suggested formation mechanisms. (Submitted to A&A.
Postscript figures available via annymous ftp to "chiron.astro.uu.se" in
directory pub/Preprints/P87)
