I CONTENTS. 
Botany. TH. WEEvErs: “Concerning the influence of light and gravitation 
on pellia epiphylla.” 2. 
— D. TOLLENAAR and A. H. BraAUW: “Light- and dark-adaptation of a 
plant cell.” 17. 
— C. E. B. BREMEKAMP: “On anti-phototropic curvatures occurring in 
the coleoptiles of Avena.” 177. 
— V. J. KONINGSBERGER: “A method of recording growth under various 
external influences.” 209. 
— W. E. pe Mor: “On hypotriploid dwarf-hyacinths derived from triploid 
dutch varieties through somatic variation”. 251. 
BREMEKAMP (C. E. B). On anti-phototropic curvatures occurring in the 
coleoptiles of Avena. 177. 
Bruins (H. R.) and Ernst COHEN. The use of the Zeiss waterinterferometer 
(RAYLEIGH-LOWE) for the analysis of non-aqueous solutions. 114. 
Bu 6832 = X 1834 (The orbit of). 72. | 
Bups (On budding and coalescence of) in fungia fungites and fungia actini- 
formis. 257. 
CARBON (On the behaviour of amorphous) and sulphur at high temperatures 
and on carbon-sulphides. 92. 
CATE (JASPER TEN). Regarding automatic movements of the isolated iris. 84. 
Chemistry. A. Smits and C. J. pe GRUITER: "The electromotive behaviour 
of aluminium”. III. 86. 
— J. P. Wisaur: “On the behaviour of amorphous carbon and sulphur 
at high temperatures and on carbon-sulphides”. 92. 
— Ernst COHEN and H. R. Bruins: “The use of the Zeiss waterinter- 
ferometer (RAYLEIGH-LOWE) for the analysis of non-aqueous solutions’. 114. 
— J. BOESEKEN, CHR. VAN Loon, Derx and HERMANs: “The condition 
of motion of the molecules in space”. 198. 
CiLiARY BODY (Concerning an isolated muscle of the) of the pigeon’s eye, 
situated near the eye-split. 123. 
COHEN (ERNST) and H. R. Bruins. The use of the Zeiss waterinterfero- 
meter (RAYLEIGH-LOWE) for the analysis of non-aqueous solutions. 114. 
CoLeopTiLes of Avena (On anti-phototropic curvatures occurring in the). 177. 
CONDITION of motion (The) of the molecules in space. 198. 
CONTRACTION (A simple method to obtain a curve of the) of the M. arrectores 
pilorum. 81. 
Corput (J. G. VAN DER). On an integral notion of DEeNJoy. 131. 
CRANIAL-FORM (On the) of homo-neandertalensis and of pithecanthropus 
erectus, determined by mechanical factors. 313. 
Cryo-Biology. P. GiLBERT RAHM: Weitere physiologische Versuche mit 
niederen Temperaturen”. 192. 
