CONTENTS XXIX 
ZERNIKE (F.). An interpolation-formula for resistance-thermometry at low tempe- 
ratures. 914, 
— The clustering-tendency of the molecules in the critical state and the extinction 
of light caused thereby. 1520. 
Zoology. K. Kuiper Jr.: “Physiology of the air-bladder of fishes”. 572. 
— G. ©. J. Vosmaer: “On the occurrence of desmas or desmoids in Hymeniacidon 
sanguinea”. 1159. 
— J. F. van BEMMELEN: “On the phylogenetic significance of the wing-markings 
in Hepialids”. 1255. 
— J. Borke: “A contribution to the knowledge of the phylogeny of the wing-pattern 
in Lepidoptera”. 1557. 
— D. pe LANGE Jr.: “Critical and theoretical considerations about the origin of 
the primary foetal membranes in vertebrates”. 1604, 
ZWAARDEMAKER (H.). On measurement of sound. 165. 
— presents a paper of Mr. F. Roers: “On after-sounds’. $11. 
