ELEMENTARY EXPERIMENTAL PHYSIOLOGY 13 



The power of determining the position and movements of the 

 various parts of the body and the head in space, since it depends 

 upon the stimulation of structures by our own position and move- 

 ment, has been called the Proprioceptive power, and the structures 

 involved may be said to constitute the Proprioceptive Mechanism. 



(Read Muscle- joint Sense and Labyrinthine Mechanism in Text 

 Book.) 



Lesson II. To be provided for the Class. 



1. Section of foliate papillae from the tongue of the rabbit under a micro- 

 scope. 2. Models of the middle ear and of the internal ear. 3. Section of (a) 

 the cochlea and (6) of the lower part of the Eustachian tube under microscopes. 

 4. Sections of a semicircular canal and of an ampulla under microscopes. 

 5. Politzer's bag. 6. A series of tuning forks on sounding boards giving from 

 say 50 vibrations per second upwards ; a series of steel cylinders with hammers 

 giving from 8192 v.s UT to 65,536 v.s UT 10, or a Galton's Whistle. 

 7. Tuning forks on sounding boards giving 512 v.s doh, 1280 v.s me, 1536 

 v.s soft and 2043 doh above. 8. Models of larynx, or a human larynx pre- 

 served in formalin and glycerine and split in the vertical mesial plane. 

 9. Model larynx, laryngoscopes with forehead mirrors, a vessel containing 

 1 per cent, of lysol and another of water to wash the laryngoscopes. 



To be provided for each pair of Students. 

 (Each student must bring a clean camel's -hair paint brush.) 



1. In small glasses, solutions of (i) Cane sugar, 2 per cent. (ii) Quinine 

 sulphate, saturated solution. (iii) Hydrochloric acid, 0'5 per cent. (iv) 

 Common salt, 0'5 per cent. 2. Large glass of water for rinsing mouth. 

 3. Daniell's or other galvanic cell with two wires, or two wires attached to the 

 galvanic terminals of the switch board. 4. Discs of apple, potato and onion. 

 5. A set of pill boxes with shot weighing about 50, 55, 60, 65, 70, 75 and 80 

 gms. marked as in Lesson I. 



LESSON III 



VISION 



A. STRUCTURE OF EYE 

 I. Dissection of the Eye of the Ox or Sheep, fresh or out of Formalin 



Examine the eye. Identify the cornea and sclerotic, and 

 notice the entrance of the optic nerve to the inner side of the 

 antero-posterior axis. Note the shape of the pupil and compare 

 it with that of the human subject. Now divide the eye into an 

 anterior and a posterior half by cutting through the equator of the 

 sclerotic with a sharp razor. 



Note the gelatinous vitreous humour in the posterior chamber. 

 Note the black-coloured choroid coat inside the sclerotic. In the 

 anterior segment note that the capsule of the vitreous (hyaloid 

 membrane) is firmly attached to the front of the choroid and that 

 it holds the lens in a capsule behind the pupil. Strip the hyaloid 

 membrane and the lens in its capsule from the choroid, and observe 

 how firmly attached it is to a series of ridge-like thickenings of the 

 choroid just behind the junction of the cornea and sclerotic the 



