It is rapidly oxidized on heating to a temperature of 500°-600° C., and also when fused with nitre or potassium chlorate.
The greater part of the under-jaw is formed by the right and left dentaries, which in all recent birds are fused together in front.
The vertebrae are stereospondylous, the centrum or body and the arch being com pletely fused into one mass, leaving not even a neuro-central suture.
(2) Dorsals, those which begin with the first thoracic rib, and end at the last that is not fused with the ilium.
Sieve Tubes.The sieve tubes consist of partially fused rows of cells, the transverse cr lateral walls being perforated by minute openings, through which the contents of the cells are connected with each other, and which after a certain time become closed by,the formation of callus on the sieve plates.