XXII CONTENTS. 
WIND (c. H.) presents a paper of Dr. C. Easton: “Oscillations of the solar activity 
and the climate.” 368. 
WINKLER (C.) presents a paper of Dr. L. J. J. Muskens: “Degenerations in the 
central nervous system after removal of the Flocculus cerebelli.” 282, 
— presents a paper of Dr. 8. J. pr LANGE: “On the branchings of the nerve-cells 
in repose and after fatigue.” 599. 
ZAKRZEWSKI (c.) and H. KaMERLINGH ONNEs. Contributions to the knowledge of 
VAN DER WaaLs’ yp surface. IX. The conditions of coexistence of binary mixtures 
of normal substances according to the law of corresponding states. 222. 
— The determination of the conditions of coexistence of vapour and liquid phases 
of mixtures of gases at low temperatures, 233. 
— The validity of the law of corresponding states for mixtures of methylchloride 
and carbon dioxide. 285. 377. 
ZEEMAN (P.) and J. Gees. Double refraction near the components of absorption 
lines magnetically split into several components. 435. 
ZIEWEN (TH.). On the development of the brain in Tarsius spectrum. 331, 
Zoology. P. P. C. Hoek: “An interesting case of reversion.” 90. 
— Tu. Zrenen: “On the development of the brain in Tarsius spectrum.” 331. 
ZWAARDEMAKER (H.). On artificial and natural nerye-stimulation and the 
quantity of energy involved. 147. 
— On the relative sensitiveness of the human ear for tones of different pitch, 
measured by means of organ pipes. 549. 
