276 MALL. [Vor. XIX. 
The embryo has an atrophic head and cord, showing, how- 
ever, enough structures to fix its age at four weeks. The 
spinal cord is dilated and dissociated and the brain is solidi- 
fied, filling the entire head. The eyes are destroyed. The 
blood-vessels are enormously distended with blood, which also 
fills the tissues of the body, obscuring them to a great extent. 
The epidermis is intact. 
Fic. 285b.—Section of the embryo. X 13 times. 
