562 THE MICROSCOPE. 



of aggregated cells, and is usually denominated the vesicular 

 neurine. To collections of this vesicular substance the term 

 " ganglion " is applied. Physiological and pathological re- 

 searches have rendered it more than probable that the 

 vesicular and the fibrous substances have universally 

 separate and distinct offices in the animal economy; the 

 ganglionic structures being the source of functional change, 

 and the fibrous matter being simply for the conduction of 

 impressions originating in the former. 



All the sensory ganglia, it may here be noticed, besides 

 their instrumentality in inducing the simpler forms of 

 consciousness, react upon the muscular system, when 

 stimulated from without ; and that, too, in apparent inde- 

 pendence of thought or volition. The movements thus 

 arising, Dr. Carpenter very aptly designates consensual: 

 they are seen when the dazzled eye withdraws instinctively 

 from the light, or when the startle follows upon a loud 

 and unexpected sound. 



Consolidated Tissues. Such tissues are formed by a 

 chemical combination with the gelatine of the fibre ; this 

 in cartilaginous formations is 

 termed chondrine, the cells of 

 which become consolidated by 

 calcareous deposits, and a 

 gradual transition results there- 

 from. Cartilage is the firmest 

 structure next to bone met 

 with; it is very elastic, and as 

 an intercellular substance is 

 generally divided into two 

 kinds. Between the ribs we 

 find this substance uniform, 

 with a bluish appearance, and 



^ZKSSSSS: s^tfon r/veg' slightly gran ular ; this is termed 

 etabie tissue, with superimposed true, or white cartilage. The 

 other form of intercellular sub- 

 stance is developed in fibrous substances; and it is in 

 this peculiarly-formed felt-work, that cells with nuclei are 

 found. This is termed yellow, fibrous, or spongy cartilage, 

 the yellow colour depending on the mode of fibrous arrange- 

 ment of the intercellular substance : it is found in the ears, 

 and other parts. 



