( m ) 



At N. opt. the optic Xerve is stimulated, At r. lacr. X. V. tlie firsf 

 branch of the fifth Nerve. The signal causes the rise of the zeroline as long 

 as the faradisation lasts. The distance of the coils in exciting the optic 

 Xerve was 8 cm., in exciting the ;•. lacrymalis it was 12 cm. 



fig. 4. Effect upon respiration during faradisation of the second branch of the titth 

 Nerve. 



The tracings 1 and 2, does not exactly part from the same point as the 

 tracings 3 — 4. The rise ot the signal takes place at a moment that the 

 tracing 3 and 4 have already passed. Tracing 1 and 2 must be read, placed 

 somewhat more to the right side. 



Fig. 5. Effect upon respiration during faradisation of the wall of the posterior end 

 of the S'l» ventricle. 



In I, II, III .lad rV the stimulation takes places with increasing currents 

 (Distance between the coUs of 9, 7, 5 and (4 cm.). 



I'ig. 6. Effect upon respiration of a mechanical stimulation (ligature) of the Nerves, 

 which reach the orbita. 



The slow respiration existing before, immediately varies. There exists a 

 type of respiration, wherein two different rhythms can be recognised. The 

 one is slow and the other, quick one, is superimposed upon it. 



Fig. 7-11. Effect upon respiration during and after the stimulation of the olfactory 

 tract and of the lobus olfactorius. 



Fig. 7. During the faradisation of the olfactory tract respiration becomes slower. 

 (Distance between the coils 6 cm.). 



Fig. 8. Faradisation of the lobus olfactorius (Distance between the coils 8 cm.) in y. 

 Arrest in expiration, follows the stimulus. A few irregular respirations bring 

 the thorax in an inspiratory position. Deep and slow inspirations follow^ 



Fig. 10. Idem in point e. Slowing of respiration, increasing of the expiratory state, 

 arrest in expiration. Afterwards arrest in inspiration, deep sighs and finally 

 deep and slow respiration, lasting a very long time. 



Fig. 11. Upper tracing. Idem in point </ (7 em. distance between the coils). Slowing 

 of respiration, arrest in expiration, afterwards irregular and superficial respi- 

 rations extending the thorax, sighs, and finally deep and slow respiration. 



Lower tracing. Idem in point /; (10 cm. distance between the coils), 

 A\)thout a precedent arrest in expiration, the described movements of inspiration 

 appear nearly at the same time after the stimulus, as in the upper tracing. 



Fig. 9. Diagram of the brain of a dog, showing the lateral piirts of the rhinencephalon 

 which were stimulated. After faradisation of the point f and // the expiratory 

 effects are noticed. 



Physiology. — ^ The influence of salt-sol nt ions on the volume of 

 animal cells". (■2°'' Communication). By Dr. H. J. Hamburger. 



At the Mav-meetiug- of last year was discussed the influence 

 of salt-solutions of the volume of red blood- corpuscles, white blood- 

 corpuscles and spermatozoa. We ca'i now communicate the result of 

 similar experiments made with epithelium-cells, derived from four 

 different places: the intestines, windpipe, urine-bladder and the 

 oesophagus. 



