Contents and Price List Vols. I-XXIII 13 



pp. Price 



4. Hitchcock, A. S., Studies of subterranean 

 organs. II. Dicotyledonous herbaceous 



plants of Manhattan, Kas 13 .25 



5. Von Sciiuenk, Hermann, A severe sleet 



storm 9 .25 



6. NiPiiER, Francis E., Certain properties of 

 Ijwht-struck photographic plates 17 .50 



7. Klem, Mary, The development of Agarico- 



crinus 19 .50 



8. Alt, Adolf, Glandular structures appertain- 

 to human eye 25 .50 



9. Nii'iiER, Francis E., Positive photography, 



with special reference to eclipse work 7 .10 



10. Nipher, Francis E., Frictional effect of rail- 

 way trains upon the air 15 .25 



VOLUME XI 225 $3.50 



No. 1. Baker, Frank Collins, Revision of Lim- 



naeas of northern Illinois 25 .45 



2. Rolfs, P. H., Florida lichens 17 .15 



3. PoATS, T. G., Lsogonic transformation 11 .15 



4. NiPHER, Francis E., Relation of direct to re- 

 versed photographic pictui'cs 21 .75 



5. Nipher, Francis E., Specific heat of gaseous 



nebulae in gravitational contraction 8 .25 



6. Lefevre, George, Advance of zooology in 



19th century ' 35 .25 



7. Nippier, Francis E., Physics during the last 



century 21 .25 



8. Trelease, William, Progress in botany dur- 

 ing 19th century 19 .25 



9. Baker, Frank Collins, Interesting mollus- 



can monstrofiities 5 .25 



10. Weller, Stuart, Kinderhook fauiuil studies. 



III. P'aunas of beds 3-7 at Burlington, la.. 69 1.00 



11. Harris, J. Arthur, Normal and teratological 



thorns of Glcditschia triacanthos 9 .25 



VOLUME XII 111 $3.50 



No. 1. CiiEssiN, Alexander S., True potential of 



force of gravity 11 .25 



2. Mackenzie, K. K., and B. F. Bush, Lespe- 



dezas of JMissouri 11 .50 



3. Chessin, Alexander S., Motion of gyro- 

 scopes 15 .45 



4. Norton, J. B. S., Notes on plants of S. W. 



I United States 9 .50 



5. Baker, C. F., Revision of Elephantopeae. I. 15 .35 



6. Bush, B. F., N. American species of Chaero- 

 phyllum and of Triodia 23 .50 



7. ]\lACKENzn;, K. K., a.nd 1>. F. lUsu, New 



plants from Mi&souri 13 .50 



