THE HOUSE, ASS, MULE, QUAGGA. 253 



Septum, A part intended to separate two cavities from each 

 other, or to divide a principal cavity into several secondary 

 cavities. 



Serous. Thin, watery. Relating to the most watery portion 

 of animal fluids, or to membranes that secrete them. 



Sol'iped. An animal whose hoof is not cloven ; one of a group 



of animals with undivided hoofs; a soiid ungulate. Webster. 



The family ' Solipeda ' consists of several species of horse, 



namely, the ass, the mule, and the quagga. Touatt. 



Sphenoid. Wedge-shapad. 



Sphenoid Bone. An azygous (single) bone, situate on the me- 

 dian line, at the base of the cranium. It articulates with all 

 the bones of that cavity, supporting them and strengthening 

 their union. Its form is singular, resembling a bat with its 

 wings extended. 



Spina Vento'sa. See ' Osteo-sarcoma.' 



Styloid. (A style, a peg, a pin.) Shaped like a peg or pin. 



SuBMAX^iLLARY (from suh, 'under,' Tnaxilla, 'the jaw'). That 

 which is seated beneath the jaw, 



Suppuka'tion, Formation or secretion of pus. It is a frequent 

 termination of inflammation, and may occur in almost any of 

 the tissues. This termination is announced by slight chills, 

 by remission of the pain, which, from being lancinating, be- 

 comes heavy ; by a sense of weight in the part, and, when 

 the collection of pus can be easily felt, by fluctuation. When 

 pus is thus formed in the areolar membrane, and is collected 

 in one or more cavities, it constitutes an 'abscess.' If it be 

 formed from a surface exposed to the air, it is an ' ulcer.' and 

 such ulcers we are in the habit of establishing artificially in 

 certain cases of disease. 



Supra. A common Latin prefix, signifying 'above.' 

 Suture. A kind of immovable articulation, in which the bones 

 unite by means of serrated edges, which are, as it were, dove- 

 tailed into each other. The articulations of the greater part 

 of the bones of the skull are of this kind. 

 Sym'physis, a union of bones. The bond of such union. The 

 aggregate of means used for retaining bones in ^itu (natural 

 situations) in the articalations. The name symphysis has, 

 however, been more particularly appropriated to certain artic- 

 ulations, as the ' symphysis pubis,' ' sacro-iliac symphysis,' «Sz;c. 



