GLOSSARY 247 



Cutis vera. The true skin. 



Cytoblastema (Greek, Tcutos, a cell ; blastema, growth). 



Cell protoplasm. Cytoplasm, protoplasmic matter 



of a cell. 



Defensive bodies. Substances in the blood that tend to 

 destroy micro-organisms. (Germicidal, germ-destroy- 

 ing-) 



Deglutition. Act of swallowing. 



Deliquescent. Melting away by absorption of water. 



Derma, The skin. 



Dialysis (Greek, dialusis, a loosening). Separation of 

 substances by means of an animal membrane. 



Diaphragm. Midriff, a membrane-muscular partition 

 between thorax and abdomen. 



Dissociation. Splitting up of compounds without chemical 

 change. 



Duodenum (Latin, duodeni, twelve). The first portion of 

 the small intestine. 



Ectoderm, Endoderm (Greek, ektos, outward; endon, 



inward). Two layers of the early embryo. Ecto- 

 derm is sometimes termed the epiblast, and the endo- 



derm, the hypoblast. 

 Elastic tissue. Yellow fibrous tissue, found in certain 



ligaments. 

 Emulsion (Latin, emulgere, to milk out). A special kind 



of mixture of various substances (see text). 

 Endosmose (Greek, endon, within ; osmosis, impulsion). 



The passing of a fluid through an animal membrane 



from a rarer into a denser fluid. 

 Enzymes. Chemical substances secreted by living cells 



or by micro-organisms which act catalytically. 



Sometimes termed ferments. 

 Epidermis (Greek, epi, upon ; derma, the skin). The 



superficial layer of the skin, covering the dermis, or 



cutis vera, the true skin. 

 Epiglottis (Greek, epi, upon; glottis, glottis). A fibro- 



cartilage in front of the glottis to protect the opening 



into the larynx. 



