C/O NOY ENED s XXIII 
ZWAARDEMAKER (H.) presents a paper of Mr. T. P. Feenstra: “A new group 
of antagonizing atoms”. I. 99. II. 341. 
— Specific smell intensity and the electrical phenomenon of cloudlike condensed 
water vapours in chemical series. 334. 
— The electrical phenomenon in smell-mixtures. 551. 
— Radium as a substitute, to an equiradio-active amount, for potassium in the 
so-called physiological fluids. In collaboration with T. P. Feenstra. 633. 
— presents a paper of Dr. E. L. Backman: “The olfactology of the methylbenzol 
series’. 943. 
— On the analogy between potassium aud uranium when acting separately in 
contradistinction to their antagonism when acting simultaneously. 1043. 
