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The Chairman : As regards Professor Sven OdCn's paper, he recalls an early investigation of my own in which I once put forward the theory that you can explain the properties of clay by appealing to the idea of the minuteness of the particles. I feel somewhat embarrassed that that investigation has been brought forward again under such distinguished

In the sccontl cliiss arc tliose bodies \vliicli ilre elilploycd for the ~~rotliiction of large bulks of prcfcrnbly hcnvy vnpoiirs wliich sniot,licr tlic firc by prcveiit.ing iicccss of osygen or by rcducing tlie osygcn constituent of tlie nnscs, surroitnding tlic fire to n point; n t wliicli combustioil IS not rendily cnrrictl on. A third iiicnns for fire fighting is tdic npplicntion of solid mii,t crinls, such ns siiiid, earth, or preferably bodies irliich give ofl lion-inflnmmeblc grises wlicn licntcii. Tho fourth and most. modcrii iiicnns is t h t ; kno\\.n ns the li'onni Jlethod.Gltoul~ 1 We will duiil with tlicsc wrioiis groups one by one.In this short rcvicw it is iiitcatleil only to deal with whrit iiiap be cnlleil " portnblc " or " 11nnd " iiienm for figlitiiig fires in t.licir incipient, stnge. Tlic various forms of wliiit iirc known tis " S mid A " cipplinnccs (r;oda euid ncid) nrc ninong t,lia best blown and tho most widely tlistributcd. A solution of sodium bicnrboiiutc is coiitciiiicil in n 1,ressuro-rcsistiiig vessel and sulpliiirio ncitl is coutniiicd in 1\11 interlid vcssel, wliicli n t desire cciii tic cnused to inis wit.h t.he sodiion bicnr-0