of a neunnel under tory banquet as tunnelneared completion. to ternation to fizz o tantly to fizziness, memorably enlivening tive process.

    Apart from avoiding s altogetrategies are reliablysuccessful against t is to suffer only a very s exposure to t is o dept  ill effect. t stay under long enougrogen in tem todissolve into tissues. tion is to ascend by careful stages. ttle bubbles of nitrogen to dissipate harmlessly.

    A great deal of  surviving at extremes is oo traordinaryfateam of Jot and J. B. S. andards ofBritisellectuals, tstandingly eccentric. to an aristocratic Scottis  spent mostof ive modesty as a professor of p Oxford. -minded. Once after  airs to cy o return and ime. ion o travel to Corno study  grandson of t. ime, parodied oucist Edantamount in t Counter Point .

    to diving o  t intervals necessary to manage an ascentfrom t getting t erests ranged across tudying altitude sickness in climbers to tstroke in desertregions. icular interest in ts of toxic gases on tounderstand more exactly aking and measuring  only ion level —a level, as trevor Norton notes in ertaining ory of diving, Stars Beneationally removed from nearly certain lety.

    o posterity as J.B.S., erest in  from infancy. At t is it oxyhaemoglobin or carboxyhaemoglobin?”

    t s. By time eenager, ten tested gases and gas masks togetaking turns to see  took to pass out.

    took a degree in science (udied classics at Oxford),  scientist in , mostly in Cambridge. t PeterMedaio