FILM Foi;.\IATI()N. 



121 



colonies or islets of 

 yeast which hiivt- 

 origiuiiteJ on thf 

 surface of the li(jui(l 

 itself. Other con- 

 ditions heiiifj C'<jual, 

 the iliniensiuiis at- 

 tiiine«l l>y the lilni 

 vary uccunling to the 

 species of yeast. 



The form of the 

 cells from which the 

 film is constiiu-ted 

 ditVers in general 

 from that of the 

 sedimental cells, hy 

 uttaitiiiig greater 

 longitudinal de- 

 velopinent(uj) to 150 

 fx and uvei), whilst 

 the tnmsverse mea- 

 surement is often 

 less than in the cells 

 of sedimentiil yeast. 

 The second char- 

 acteristic is a more 

 or less abundant 

 branching. An e.\- 



W 



amj 



K' is shown in 



Fig. 132. 



The time re«jnired 

 for the ilevelojinient 

 of the film to become 

 manifest differs, 

 other conditions 

 being etjual, with 

 the species of the 

 veast, and is lonirer 

 the lower the tem- 

 pemture of the cul- 

 ture. According to 

 a series of determin- 

 aitions made on 

 species of ISarrharo- 



»«//'■»>■ bv II.\NSEN' 



(XVI.), " the time 

 required for N<j''- 

 rh a rom yccs cercrhiiv 

 I. at 33° to 34'^ C. i> 

 about 9 to 18 davs ; 

 at 20' to 28' v., 

 about 7 to 1 1 days ; 



at I 



to 1:5 C 



I) 



/ 





r 



^ 



00\^L> 



ir^ 



u 



about I ; to 30 davs ; 



iKiO. 133, — SarchAToniyce* ellipsoldeui I. Han««n. 



Cflls .-nut cb.iins o( cells trom the film of an old culture 

 in beer wort. M.vrn. : -..-^ lA'^rr Ucin^m.^ 



