New solar abundances have been derived for Li, Be and B. They are mainly based on high-resolution spectra obtained at the Jungfraujoch Scientific Station (Switzerland). For Li, the abundance results from a discussion of the photospheric and sunspot spectra. Our results, log
N
Li = 0.42, log
N
Be = 1.17 and log
N
B < 2.80="" (in="" the="" log="">
N
H = 12.00 scale), are lower than the previously admitted abundances for these elements. The far UV spectrum (
< 3000="" å)="" has="" also="" been="" considered="" in="" each="" case.="" the="" meaning="" of="" our="" results="" is="" discussed="" from="" the="" point="" of="" view="" of="" the="" destruction="" of="" these="" elements="" during="" the="" evolution="" of="" the="">
This work has been sponsored in part by the Air Force Cambridge Research Laboratories, OAR, through the European Office of Aerospace Research, U.S.A.F., under Contract AF 61 (052)-955, and by the 
Comité National Belge de la Coopération Géophysique Internationale
(C.N.B.C.G.I.).