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I-lortiioites rcguliitc iiiost of the vital fuiictiotis, includitig gro\sth, tnctnbolisiii, ntitl rcproductioii. I'rcscnt qiiestiotis :ire : 120 niiiiiinl lioriiioties iiifluciice phiits lit :ill : iiitd, if t h y do, i i i \vht \.iiy-lly stiiiiiihtitig 01' iiiiiil)it,iiig rcspirntioii iiiid uptake of iiutricats ; by iilterittg coiitluct,ioti ntitl pressure of sap ; by itfleeting the tliflcretit.intioti of tissues, iiiore especially tliose of the reproductiw orantis ? Ciiti coitiparttlilc pnthologictil eKccts bc produced '1 Esl)eriiiiettt,ntioii with iiiiltiiills is not iilw:iys siitisfiictory, titid csperitiietits with I)liiiits Iinw eiiviroitiiietttitl iititl ot,licr specid cliflicultics. L3utlingtoii,~ the pioneer of' work \vit.h niiiiiiiil liortiioiies 011 plniits, I)iisctl liis Iiypotheses 011 the rescni1)liittccs I)ct,\.ccii niiiiiiiil niid. pl:iiltt protopliistii. l.ic siiiiplifietl tccluiique tis iiiucli :IS possililc, stutlyiiig the cll'ects of thyroid glittid cstrticts 011 loots O f JI:llCjSSltS, i l l l t l C O l l c l t t t l C d tll:lt t l l C CSt~I'llCtS stitiiiilated gro\vt,li. iYi~t.lliiiii1itc1.B olitaitictl :I siiiiilirr result iipoti the gcticriil tissitc-growth of gcriiiitiiitiiig c~crciils. I3y itijcctittg t,lic cstrnct into (lortitiitit, shoots of syritipi i t t i d Iiorsc-clicsttiut lie slio\rctl stitiiiiliit.ioii of fio\veriitg. J~cIJcIIo~' cstetitlid t h e rntigc of I i r ~r ~i i o ~~c s , t ryiiig t.lie elYects ofest.riicts of't,liyroitl, tliytiius, iitlretiiils, :tiid iitlrciiiil cortes, 011 Iiyacitit.1is. 011 tlic! \vlioIc, floweriiig \ u s stitiiulti tctl, iiiicl cslminlly by tlic thyroid extract,. ~iiitiibcr of not nliriiys ciirefully-tlcsigtictl trials, of wliicli
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Alkynes have been used as precursors for aromatic compounds since Berthelot converted acetylene to benzene in 1867. The review presents new evidence on the mechanism of this first total synthesis of an aromatic compound. Presumably, its last step involves the thermocyclization of hexa-1,3-dien-5-yne