67 



6 do 



c 



o o 



c 



c 



i 



-c 



^ 



i 



Mar. 1. No change; doubtful 

 if any growth. Mor. 12. Per- 

 fectly clear. 

 Perfectlv clear 



c 

 -a 



Feb. 19. Clear. Feb. 23. Very 

 faintly clouded (like tube o"f 

 malto'se). Not yet certain 

 Avhat this faint cloudiness 

 means. Mar. 1. As before, 

 probably to be recortled as 

 clear. Mar. 12. Perfectly 

 clear. 



Feb. 15( third day). Like the tube of grape sugar 

 except that the zoogloeae can not be made 

 out clearly. Feb. 19. Hundreds of tiny 

 zooglreae are now present. Feb. 23. Sharp 

 line of demarcation in the U. Mar. 1. Like 

 tube of grape sugar, but more cloudiness and 

 more precipitate. Mar. 12. Quite cloudy, 

 more so than in any of the preceding tubes 

 and very decidedly more than in the tubes 

 of milk sugar or of maltose; no pellicle; 

 copious, pale yellow precipitate; this dex- 

 trin seems to be a particularly good food. 

 Mar. 20. No change. 



Feb. 15 (third day). Like the first except no 

 zoogloeae visible. Feb. 23. Sharp line of de- 

 marcation in the U. Mar. 12. No pellicle; 

 no visible precipitate; clouding slighter than 

 in tube of grape sugar, i. e., like that in 

 tubes of milk sugar and of maltose. Mar. 

 20. No change. 



Feb. 15 (third day). Like tube containing the 

 grape sugar, but no zoogloeae visible. Feb. 

 19. Still no zoogla'ac. otherwise like tube of 

 grape sugar. Mar. 12. Moderately cloudy, 

 only a slight precipitate. Mar. 20. No 

 change. 



Dextrin (1 per cent 

 commercial 10 

 times precipitated 

 with alcohol in lab- 

 oratory of Div. 

 Chem.. U. S. Dept. 

 Agr. This dextrin 

 contained a sub- 

 stance reducing 

 Soxhiet's solution, 

 l)ut did not redden 

 with iodine and did 

 did not reduce Bar- 

 foed's solution.) 



Mannitol (1 percent 

 M erck 's c. p., in 

 which the polari- 

 scope showed no 

 contamination). 



Glycerol (1 i>er cent 

 Schering's twice 

 distilled, .sp. gr. 

 1.260, at 30.8°, B6. 

 strictly c. p.). 



^ 



s 



S 





