30 R. H. Chittenden— Glycogen and Glycocoll in the 
A sample of dextrin dried at the same temperature gave 
Nigeli as a mean of two analyses, C. 43°52. H. 6°78, in both 
cases agreeing closely with my analyses of glycogen ‘dried at 
110?-120° C. Thus this substance, which is without doubt 
glycogen, prea in this respect with its neighbors, dextrin, 
amylo-dextrin, e 
A sample of areeabi prepared by the preceding methods 
and dissolved in water, on treatment with basic lead acetate, 
with the application of a gentle heat, yielded a heavy gelati- 
nous precipitate, which, when filtered off by the aid of a pump 
and washed with water, was found to contain lead. Dried at 
100° C, it gave by analysis tbe following result: 
1. 
2. 
Cc 21°62 21°78 
H 2°91 2°96 
Pb 48°39 48°34 
27°08 26°92 
Since this result was obtained, I find that M. Bizio* has 
already discovered glycogen in some invertebrates. Among 
the Mollusks, he fotnd it in considerable quantity in the oyster. 
With glycogen from these sources he prepared a lead com- 
pound by means of tribasic acetate of lead, and says its — 
has given me the formula €,,H, ,Pb®, ,,” which requires 
C 27-22 
3°40 
Pb 39°13 
O 30°24 
It will be seen at once that my result does not agree with 
this formula. I therefore made some further lead precipitates 
from the same and other eos Seta of glycogen, and in these 
simply determined the lead as follows 
Pb. Ist Prep. 2d Prep. 3d Prep. 4th Prep. 
No. 1. 48°39 53°63 51°45 50°27 
No. 2. 48°34 53°58 51°45 50°28 
Some glycogen was also prepared from the liver of an ox by 
the usual method and dried at 100°. It yielded by analysis: 
Calculated. 
C, eH, 20, I 
42°11 
C 41°87 41°90 
H 6°35 6°38 6°43 
O 51°78 51°72 51°46 
A lead preparation made from this gave: 
2s 2. 
Pb 61°99 61°94 
* Comptes Rendus, xx, 175. far Chemie, 1867, 745. 
