62 ELEMENTARY PHYSIOLOGY. [V. 



This preparation should be preserved to shew the 

 nerves of the cornea (cp. Less. x. C. 2). 



3. Break off the tip of the tail of a mouse or young 

 rat just killed, and pull out from the stump a 

 bundle of fine tendons. Gently stretch this over 

 a glass slide from edge to edge, and hold it in 

 this position till the edges are dry, putting a 

 drop of normal saline solution in the middle 

 only ; the fibres are thus kept extended. Cover 

 with a cover-slip. On examination the bundles 

 of wavy fibrillae will be seen, but no corpuscles. 

 Slowly irrigate with acetic acid 1 p.c., watching 

 the bundles the while under a high power. Be- 

 tween the bundles of fibrillse will be seen rows 

 of cells. Note in each the round or oval nucleus, 

 the rectangular outline of the cell, and the 

 granular cell-substance. Indications of flange- 

 like lateral processes may be seen as lines run- 

 ning along the cells in the direction of the tendon. 

 After the acetic acid has been added for some 

 little time the cell-substance becomes very indis- 

 tinct, and between the swollen bundles scarcely 

 anything is seen but rows of elongated irregu- 

 larly shaped nuclei, (cp. Action of acetic acid 

 on cartilage cells, Lesson IV. 2.) 



4. Cut transverse sections of a tendon which has 



been placed in 30 p.c. alcohol for a few hours 

 and preserved in 75 p.c. alcohol, imbedding (cp. 

 Less. VI. 1) if satisfactory sections cannot 

 otherwise be obtained: mount in dilute glycerine. 

 Observe 



