436 DR DUNCAN on Mudarine. 



a slight diminution of transparency and limpidity. As the tem- 

 perature is raised, these changes increase, and at 90 it has in a 

 great degree lost its transparency, and has acquired the consis- 

 tence of a tremulous jelly. 



If the heat be now withdrawn, and the vessel allowed to cool, 

 the jelly gradually, but very slowly liquefies, so that a day or 

 two elapses before it has entirely recovered its original limpidity 

 and transparency. 



If, instead of withdrawing the heat when it has risen to 90, 

 we continue to raise it, further changes occur. 



At 95 it is fully gelatinized, and now there appears to be a 

 separation taking place into two parts, a soft brownish coagu- 

 lum and a liquid nearly colourless, not unlike the separation of 

 the serum from the crassamentum of the blood, as it spontaneous- 

 ly contracts. 



At 98 the coagulum is evidently contracted in size, while 

 the fluid increases in proportion. 



At 130 the coagulum seems to dissolve ; probably, however, 

 it only is reduced in size by contraction. 



At 185 the coagulum is very small, and has a tenacious 

 pitchy consistency. 



At 212 little further change. 



The alterations which in this state it undergoes on cooling, 

 are next to be observed. 



At 140 the fluid is very turbid. The coagulum has not 

 diminished in size, and is now very hard and brittle. 



At 110 fluid less turbid, coagulum remarkably brittle, with 

 a resinous fracture. 



At 100, fluid more transparent, with thin detached pellicles 

 on the surface. When cooled down, even to the freezing tem- 

 perature, the coagulum remains unaltered, and very much re- 

 sembles colophony ; but, after the lapse of several days, it gra- 



