xX CONTENTS. 



zwaard e maker (h.). An investigation on the quantitative relation between 

 vagus stimulation and cardiac action, an account of an experimental investigation 

 of Mr. P. Wolterson. 590. 



z w i e R s (h. j.). Researches on the orbit of the periodic comet Holmes and on the 

 perturbations of its elliptic motion. IV. 414. 



