26 R. H. Chitlenden— Glycogen and Glycocoll in the 
impurities are arranged along lines radiating from these clear 
centers, till at some distance the mixture becomes so intimate as 
to appear nearly homogeneous until more highly magnified. 
An analysis of a very fine stone gave the following result: 
I, i. 
PUR os ak chs pee ee ee 37°41 
Ae Sc oe ee 24°62 
Ferric ox alec cee eS ees 
fale oxide - ee Ee ee oS 1°81 
Bos ss oe Pe Po eee 
Mapiiceis Joeie lw tesuueee sauce 3°46 
Teh at jou hraier Cui me gael Regan Sees ras tape 34 30 
Weeterics 2c es eet 2 
en 
seen in No. II above. This great difference can be siabdintion 
for in no way save by the evidence, which the microscopic ex- 
amination affords, that the stones are mixtures of minerals 
Nihon have been carried into the amygdaloidal cavities of the 
. The stones that I have seen. appear to consist, like the 
eau dchlonte largely of impure prehnite. The higher specific 
gravity may be due to an enclosure of epidote, which is every- 
where associated with the chlorastrolite in the rocks, and more- 
over is often present in the same cavity. 
sncsampnpeamnnats 
awe VIL.—Contributions from the Sheffield Laboratory of Yale 
College. No. XXXV.—On Glycogen and Glycocoll in the 
Hiwuas Tissue of Pecten trradians ; by R. H. CHIrrENDEN, 
Assistant in Physiological Chemistry. 
THE genus Pecten is world-wide in its distribution. The 
x ig wradians is entirely American, being found most abun- 
ntly on the eastern shores of the United States. It is closely 
allied to the ve abies and English species opercularis and 
maximus. e large central muscle which closes the valves of 
this aie es is highly valued as an article i food, although its 
peculiar sweet taste is objectionable to som 
oe this central muscle the ‘iliarta: experiments were 
@t 
