GLOSSARY. 



Abscissa. The line forming the basis of measurement of graphic 

 records, along which the time measurement is commonly made. 



Accommodation. The focussing of the eye for different distances 

 it depends upon changes in the lens, which becomes more convex 

 for near objects. 



Acinous glands. Secreting organs composed of small saccules filled 

 with glandular epithelium connected with the twigs of a branched 

 duct ; like the berries on a bunch of grapes. 



Adenoid tissue. The follicular part of lymphatic glands composed 

 of recticular tissue containing the lymph corpuscles. 



Adequate stimulus. The particular form of stimulus which excites 

 the nerve-endings of a special sense organ. 



Afferent nerves. Nerves bearing impulses to the great nervous 

 centres, from the various parts of the body, so as to give infor- 

 mation to the sensorium, or to excite reflex actions. 



Agminate glands. A name applied to those lymph follicles that 

 occur in groups in the lower part of the small intestine. 



Albumin. A term, derived from the Latin for the white of egg 

 (albumen), used in physiology to denote a complex chemical 

 substance which may be obtained from ova, blood-plasma, and 

 many tissues of animals and plants. 



Albuminoids. A class of nitrogenous substances allied to the albu- 

 mins in composition, but differing from them in many important 

 respects. 



Allantois. A vascular out-growth from the embryo which in mam- 

 mals helps to form the placenta, and in birds becomes the respi- 

 ratory organ of the embryo. 



Alveoli. The term used to denote the small cavities found in some 

 parts, such as the air-spaces of the lungs. 



Amnion. The membranous sac which grows around the embryo 

 and envelops the foetus while it is being developed in utero. 



