685 



cc. 10 o/o HCl per 

 50 cc mixture. 



DESCRIPTION. 



0.1 

 0.3 

 0.4 

 0.5 

 6 

 O.T 



0.8 and 0.9 



1 



2 



21/4' 



23/, 



3 



31 5, 33,,, 4, 41 i 



41 o 



5, 51, 

 5' (2 



6 



6', 



6>/2 



1 

 8 



liquid. 



liquid. 



thick pap; beginning of strip of transition. 



thick liquid, a few little lumps. 



the same. 



a somewhat thick pap, coagulating on stirring; begin- 

 ning of the range of coagulation. 



strong coagulum, serum whity. 



coagulated, serum fairly clear, (acid added 0.018 N). 



the same, serum fairly clear. 



the same, serum white. Upper-limit first range of coa- 

 gulation. 



liquid, a few small lumps on stirring. Therefore sharp 

 transition. 



liquid with some skin. 



liquid; lower limit liquid range. 



liquid ; no skin. 



liquid on stirring some skin or streak. Upper-limit 

 liquid range. 



the same, a piece of skin (therefore irregularity). 



the same, more skin. 



the same, a fair quantity of skin. 



like pap (at an other time only a fair quantity of streaks). 



very soft pap, almost coagulated. 



coagulated, but serum quite white, therefore far from 

 complete. Lower-limit second range of coagulation. 



coagulated, fairly stiff, serum white. 



the same, serum white. 



the same, serum white. The percentage of latex in this 

 mixture is 58.8 'Vo- 



All otiier example vvitli 30° , latex: (See foUowiii'^ page). 

 Of course the coagiilmn is always soft, because the mixtures 

 onlj contain 30 7o latex, i.e. about 10', rubber. 



Quite typical are the sharp transitions at the first range of coa- 



