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<br />SIrVlt,,'rJ for",i'lg <br />from (l (lOIlU/'U <br />clot.d aft.'r J....d. <br />ing,01.'..rJ/a"ilil, <br />PI. PhotoK"Jpk <br />(oI<rt<'1)' [' S. <br />Wt"<lth", [ll/relll< <br /> <br /> <br />redudinn of rellecti\'ity Ihruuf;:h ;tppl)'in~ (~arhnn black uT :;onw other <br />agent to ~1I0W and ice surfan's. or the reductio/l of evapuratlo/l from <br />lakes and seas on a wide scale thf(Ju~h evaporation rt'tardants like Ct'ty! <br />alcohol. There is alsn the eWIl morl" remote pos..o;;ihiJity of major climatic <br />moditicatiun throul':h .'stttrinJi:" or otherwise manipulatin~ tht' action or <br />compositioll of air masses. But all of these methods are of surh va"t <br />scope and pott'ntial power that much mure rl"search must bt, undertaken <br />on tht'm hefore we arl" f('ady en:'1I (II experiment in their applicalion. <br />Prest'nt discus."ion of thl" practical importance of wt'alht'r muditicatioll <br />therefore must rest on cloud ~edinJ.! 10 induce rrt'Ciritatioll. <br />Cloud ~t'erling is tht' inlroounion of artifIcial al:('nts of nucleation into <br />clouds so as to modify their ~tructure and motion. In some instann>s it <br />may be to dissipate the cloud. but more commonly ~t'('(ling is undert.lkt'n <br />to encoura!!:c th", formation and J.!TOwth of droplets of sufficient sizt' to <br /> <br />19 <br />