GLOSSARY. 171 



Diapede'sis (Gr. dia, through ; pipto, I fall). The passing of 

 leucocytes from the blood into surrounding structures 

 through the coats of vessel. 



Diastat'ic action (Gr. diastasis, a standing apart, separation 

 from dia, through, asunder ; histemi, I cause to stand). 

 The process of converting starch in glucose by a hydro- 

 lytic ferment ; e.g. ptyalin. 



Dichrdic (Gr. dis, twice, double; chroma^ colour). Applied 

 to haemoglobin crystals which are bluish-red by trans- 

 mitted and scarlet by reflected light. In solution red 

 by reflected, green by transmitted light. 



Diffusion circles (L. diffundo, I pour out on all sides). 

 A blurring of the retinal image due to imperfect accom- 

 modation. 



Diop'ter (Gr. dis, twice ; ops, vision). The standard by which 

 lenses are measured. Represented by a lens having 

 a focal length of one metre. 



Diplo'pia (Gr. diploos, double; ops, vision). Double vision. 

 A condition in which images do not fall upon correspond- 

 ing points of the retina. 



Dissociation (L. dissocintio, a separation). The process by 

 which a gaseous interchange is maintained between the 

 air in lungs and the blood. 



Distal (L. dis to, I stand apart). A part which is relatively far 

 from the centre. Peripheral. 



Donglas, Pouch of. A space formed by recto-vaginal fold of 

 peritoneum. 



Dys-albumose (Gr. dtw, to make one's way into ; alba, white). 

 A proteid substance probably identical with hetero- 

 albumose. 



Ebner's gland. Serous glands of the tongue found near 



circumvallate papillae. 

 Elec'trode (Gr. elektron, amber). The terminal or pole ot a 



wire connected with a battery. 

 Electrolysis ( Gr. elektron, amber ; luo, to loose, to release). 



The electrical decomposition of a fluid, into anions at 



positive pole and kations at negative. 

 Elei'dine. A substance found in the cells of stratum granu- 



losum of skin, supposed to become keratin. 



