Pulp and paper magazine of Canada . large English paper millusing large ciuantit!cs of mechanical andchemical pulps. The mill in question kept l;irge ciuan-tities of pulp stored in the open in largestacks, exposed to th.^ weather for longperiods of time. During the year 1907some of the stacks Of mechanical woodpulp were opened up and discovered tobe seriously damaged by rot ; to such anextent had jhe deterioration gone, that these growths was a more or less blackish discoloration in the pulp producedby a microscopic fungus, described asa species of Cladosporium : Fig I shows the mycelial threa
Pulp and paper magazine of Canada . large English paper millusing large ciuantit!cs of mechanical andchemical pulps. The mill in question kept l;irge ciuan-tities of pulp stored in the open in largestacks, exposed to th.^ weather for longperiods of time. During the year 1907some of the stacks Of mechanical woodpulp were opened up and discovered tobe seriously damaged by rot ; to such anextent had jhe deterioration gone, that these growths was a more or less blackish discoloration in the pulp producedby a microscopic fungus, described asa species of Cladosporium : Fig I shows the mycelial threads ofthis fuH^^us, sketched under a power of700 diameters. Fig. 2 shows the mycelium growingthrough one of die discoid markings ofbordered piis of coniferous wood. It is evident trom this, Fig. 2, tnatthe fungus is of very minute nature andiLs destructive power very great. Thistype of fun.;us is evidently respond-iblcin most cases for the systematic decayof ground wood pulp, the main work ofbreaking down the fibre substance Ijtin:;. many a thousand dollars worth of pulpwas utterly ruined and 20 to 25 per the pulp was rendered soluble inwater. During the years igoS-igio, manyshipments of both Scandinavian andCanadian pulps were found to be moreor less damaged by fungoid growth androt. The writer examined a large num-ber of samples from the contaminatedbales microscopically with the view of de-termining the main cause of the deter-ioration. Numerous kinds of fungi and mouldgrowths were observed, some of whichare illustrated here. The chief effect of done by enzymes emanating from thefungus. The mycelium of this fungus was ob-served in most cases where decay hadset in, though in the cases where thedegradation had proceeded to a maxi-mum, the mycelial threads (if any) haddi^appeared along- with all trace offibrous Fig. 3 shows a type of green on the surface of the sheets ofpulp in the interior of a bale of Nor-wegian hot-ground pulp. The mycelium
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectpaperma, bookyear1903
