Stuck again - and even though I do not enter the things I HATE not to complete.So here goes, as I rely once more on the kindness of strangers. 36a the geological period following the Carboniferous 26d the third part of a lyric ode e-o--? 33d a very sensitive device for measuring gravitational fields geo ?something 44d looks as if it should be chip but cant be if 47a is rhesus monkey is correct. Thanks to anyone who can help me here.