1919] 



SCHMITZ — STUDIES IN THE DECAY OF WOOD 



101 



previous series. After autoclaving the flasks and contents for 

 varying intervals with distilled water enough c. p. sodium 

 hydroxide was added to each flask to make the contents 1.0 

 per cent alkaline, and the entire series was again autoclaved 

 for one hour at fifteen pounds and the amount of reducing sub- 

 stances determined as mars, of copper. 



TABLE IV 



Flask no. 



43 

 44 



25 

 27 



28 

 29 



33 

 36 



LTLATED AS MILLIGRAMS 

 EXTRACTS 



Interval of autoclaving 

 with dist. H 2 



Not autoclaved 



45 minutes 



Amount of 

 reducing substances 



in 10 cc. of the 

 extracts 



6.99 

 7.63 



4.08 

 4.40 



11 hours 



5.72 

 6.36 



21 hours 



9.54 

 9.38 



Average 



7.31 



4.24 



6.04 



9.46 



Omitting those flasks which had 



toclaving 



there is a steady increase in the amount of reducing substances 



the length of previous autoclaving 



In this 



different substances from those affected by acids would, of 



be acted 



One to two per cent solutions of 



while having but little effect upon cellulose at temperat 



considerably above 



o 



C. break down the pectic bodies and 



hydrolyze gums and resins which are but slightly affected with 



dilute acids. 



Total amount of soluble substances present in the extracts. — 

 Five cc. of the various wood extracts were placed in carefully 



cleaned, dry watch gl 



The liquid was evaporated 



at a temperature of 



o 



C. the heating" bein 



tinued until the weight of the residue remained constai 

 following table shows the total dry weight in 5 cc. of 



The 



