126 ELEMENTARY BIOLOGY. [CHAl 



p. The cel/s ; flattened and close fitting ; irregul 

 in outline, as may be seen on following a. 



y. The cell structure ; protoplasm differentiated int 



ecto- and endoplasm (cf. supra) ; nucleus central 



oval or rounded. 

 8. Look for lytfiph stomata ; perforations of th 



membrane, each surrounded by small mor 



deeply stained cells. 



d. Stratified epitheliuffi ; see epidermis § 15. iii. 



3. Connective tissue. 



Of these there are two main varieties, a. and b. 



a. White fibrous tissue. This occurs typically in 

 tendons, but is widely distributed throughout the 

 body, mixed with other tissues. Tease out a bit of 

 fresh tendon in water : examine with a high power, 



cu It is chiefly made up of very fine wavy fibres 

 which, in the aggregate, impart a glistenin 

 white colour to the tissue {white fibres) ; the; 

 run in bundles parallel to one another and d 

 not branch. 



p. Treat with dilute acetic acid. Most of the above 

 disappear, but a few well-defined curled fibres 

 {yelloiu elastic fijjres) remain. Besides these 

 some small elongated and granular proto- 

 plasmic masses are brought into view {con- 

 nective-tissue corpuscles). 



b. Areolar tissue. Lay bare the muscles of the hind- 

 limb ; sheets of areolar tissue will be seen passing 

 between them and the integument. Remove one 

 of these, being careful to avoid undue stretching 

 and transfer to a slide; examine in water. 



I 



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