Muscular Tissue of Pecten wrradians. 27 
five per cent alcohol, a light floceulent precipitate is obtained 
which dissolves by agitation, leaving the fluid unaltered in ap- 
pearance ; but if three or four volumes of the alcohol are added, 
copious, permanent precipitate settles, leaving the supernatant 
fluid perfectly clear. This precipitate is of snowy whiteness, 
except when previous to precipitation the fluid has been boiled 
considerably, in which case both filtrate and precipitate assume 
a yellow or brownish color, from which the latter can ree 
by solution in cold water and reprecipitation by alcohol. The 
recipitate, if allowed to dry in contact with air, after having 
een washed with alcohol merely, soon becomes translucent on 
the edges and finally is transformed completely into a gummy 
mass, which is sticky when moistened ; but if after precipitation 
it 1s washed with ether thoroughly, it loses this property of be- 
coming gummy, which seems to the presence of 
water and of albuminous matters in small quantity. This 
gum-like mass when hard is brittle and yields on trituration a 
white hygroscopic powder showing under the microscope no 
distinct structure. A portion of the precipitate so prepared, 
dried in the air, yielded by analysis : 
; Sepa . 
, 2. C,H, 00; +H?0 or Cg 1s \6¢ 
C 39°59 39°56 40°00 
H 6°62 6°55 6°60 
O 58°86 53°89 53°34 
In this state it is not quite pure, giving with Millon’s reagent 
4 strong reaction for albumin and containing some inorganic 
matter, one specimen 1°57 per cent, another 1°38 per cent, con- 
sisting in all cases, so far as were examined, of calcium phos- 
cule of water. The substance is tasteless, gummy when 
a and gives an opaque fluid with water, seemingly a 
e solution, which passes unchanged through filter paper and 
gg charcoal, and shows no particles antes the microscope 
betas. half inch objective. When this aqueous solution is 
fluid » thin films separate, forming a scum on the top of the 
ud, which goes into solution again as the liquid becomes cool. 
