To any oontributor, on request in advance, one hundred copies of the issue containing his article will be sent without charge. Ifore copies will be s11yplied a t about cost, also if ordered in advance. Reprints are not supplied. a s for obvious reasons we desire to circulate a s many copies of Science a s possible. Authors are, however, a t perfect liberty to have their articles reprinted elsewhere. For illustrations, drawings in black and white suitable for photoengravingshouldbe suppliedby

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... oontributor. Rejected manuscriptswill b e returned to the authors only when the requisite amount of postage accompanies the manuscript. Whatever is intended for insertion must be authenticated by the name and address of the writer; not necessarily for publication, but a s a guaranty of good faith. We do not hold ourselves responsible for a n y view or opinions expressed in the communications of our correspondents. Attention is called to the ' I Wants" column. I t is invaluable to those who use it in soliciting information or seeking nem positions. The name and address o f applicants should be given in full, so that answers will go direct t o them. The "Exchange " column is likemise open. [ X~n z e r o v s complaints reacl~ 21s of clelay i n receiving "Science" tl~rouyh the naails. I t appears that it freqvently takes a week for the paper to reach Illinois, for instance. l'llis is otciny to the small al1otr;ance of fu?lcZs t o the ~Vetr; Yorlc Post-Once, tcllicll prevents the employment of a su$icient f o~c e and con~pels tllepresent force to zcorJr. i n Clecideclly ovm-crotccletl gunrters.]