1 66 HODGE. 



EXPLANATION OF PLATE VII. 

 Electrical Stimulation. — Cats. 



Fig. I. Normal. Cat 17. Left spinal ganglion of ist thoracic pair. Osmic acid. 



Fig. 2. Stimulated J hrs. Cat 17. Mate ganglion to Fig. i. Osmic acid. 



By comparing Fig. 2 with Fig. i is seen the effect of severe work (15 seconds' 

 stimulation to 45 seconds' rest) for 5 hours, the nuclei becoming darker, shrunken 

 and irregular in outline, protoplasm somewhat vacuolated. 



Fig. 3. Normal. Cat 17. Three cells from left ganglion of 8th thoracic pair. 

 Corrosive sublimate, 40°; 4 hrs. Gaule's quadruple stain. 



Fig. 4. Stimulated ^ hrs. Cat 17. Five cells from mate ganglion to Fig. 3. Like 

 treatment. 



Compare Figs. 3 and 4 for effect of stimulation upon size and character of nucleus. 



Fig, 5. Rested 6\ hrs. Cat 16. Four cells from right 8th cervical ganglion, 

 stimulated 5 hrs, rested 6| hrs. The normal of Fig. 5 is like Fig. 3. Preparation 

 same as for 3 and 4. 



Compare Figs. 5 and 4 for influence of rest. 



The above. Figs. 1-5, were drawn under magnification of Zeiss apochromatic, 

 DC. 4, obj. 2 mm., oil immersion (= X 500 diameters). Outlines drawn by aid of 

 Zeiss camera lucida, after Abbe (with longer arm). Cells of each figure contiguous, 

 as shown by connective tissue, etc., uniting them. 



