122 ILLINOIS ACADEMY OF SCIENCE 



22. Newman, H. H. 



A case of synchronous behavior in Phalangldae, Science, 45, 

 1917, 44. 



23. Osten-Sacken, Baron. 



Die Amerikanishen Leuchtkafer, Stelliner Ent. Ztg.. 22, 1861, 54- 

 55. 



24. Peairs, L. M. 



Synchronous rhythmic movements of the fall web-worm larvae, 

 Science, 45, 1917, 501-502. 



25. Pursell, J. V. 



Synchronous flashing of fireflies, Scient. Amer., 118, 1918, 71. 



26. Shelford, R. W. C. 



A naturalist in Borneo, London, 1916. 



27. Snyder, C. D. and A. H. 



The flashing intervals of fireflies — its temperature coefficient — 

 an explanation of synchronous flashing. Amer. J. of Physiol., 

 51, 1920, 536-542. 



28. Strachan, J. 



Explorations and adventures in New Guinae, London, 1888. 



29. Swindle, P. F. 



On the inheritance of rhythm, Amer. J. of PsycJiol., 24, 1913, 180- 

 203. 



30. Wheeler, W. M. 



The synchronous behavior of Phalangidae, Science, 45, 1917, 189- 

 190. 



THE CUMULATIVE EFFECT OF EOTATIONAL 

 INCEEMENTS 



COLEMAX R. GeIFFITH, UNIVERSITY OF ILLINOIS 



The interest of science in the functions of the semicir- 

 cular canals goes hack almost a hundred years to the 

 time when Purkinje, the Austrian physiologist, gave a 

 remarkably complete description of the mental exper- 

 iences commonly known as dizziness or vertigo/ In his 

 account Purkinje observed that certain eye-movements 

 and a general confused orientation accompanied long-con- 

 tinued rotation, and he came to the conclusion that these 

 events, both organic and mental, were the result of the 

 inertia of the soft parts of the body and especially of the 



^ Purkinje, J. Beitrag'e zur naheren Kenntnis des Schwindels nach 

 autog-nostischen Daten. Med. Jahrb. d. osterr. staates, 1920, 6, 79-125. 

 Erasmus Darwin (Zoonomia. the laws of organic life, 1795, (3rd ed. 1801), 

 327-356) had already described in a sane manner the popular facts con- 

 cerning' dizziness but Purkinje seems to have done the first experimental 

 work. 



