(Continued from pngt .'< of Cover.) 



VOLUME 43. 



Hobsb, H. W. — 8tudlee on Fluorite : (IV.) The K.athodo-LiimineBcence of Fluorite. pp.1 18 



1 pi. June, r.tov. 860. 



\mn..I M 1 I ) New BpedeS of Senecio awl Schornncnulon fromMexico ; (II ) Robi- 



B. L. — New or otherw) a Noteworthy Bpermatophytea, ohlefly from Mexico ; ' I III Hobin- 

 ., B. L., and Baktlett, H. H — New Plants from Qautemata and Hexii ■ oolle< ted 



chiefly by C. C. Deamj l\ u>, M L. — Diagnoses* of New Bpermatophytea from 



New Mexico pp IT t'.x June, 1907. 50e. 

 Mai;k, K. L , and CurKLAsn, M. — Maturation Stages in the Spermatogenesis of Vespa Macu- 

 late Lim. pp. 69-74, June, 1907. 15c, 

 Bbix, L The Physiological Basis of Illumination, pp. 76-06. September, 1907 

 Peircb, B. O. - On the I) t> rmination of tin- Hagni iii- Behavior "f tin- Find] Divided Core of 



an Electromagnet while a Steady Current is being Established in tin- Exciting Coil. pp. 



97-132. s, ptember, 1907. |1.20. 

 BmrODBMAOCM, C L. B. — Tlie Demagnetizing Factors f>>r Cylindrical Iron Rods. pp. 188 



September, 1907. $1.15. 



