210 



herbarium, now in the possession of the Northwestern University. 



Babcock Herbarium 



^f 



(Rcpt. Dept. Nat. 



Hist. Northwestern Univ , 1889, pp. 14-16). 

 'giatoa alba and the Dybig of Fish in lozva, 

 (Abstract, Proc. Iowa Acad. Sci., 1887-9, pp. 90, 91), 



L. H. rammcl. 



Bignonia rngosa. J 

 BrodicEa ninltiflora, 



I 



Catalogue of Plants 



D. H. (Bot. Mag. Tab. 7,124). 

 Carl Purdy. (Zoe, i. 10 1- 102). 



^P 



the Near Vicinity, M 



(Pamph. pp. 2Gy Ri- 



March 



xph 



f the Mosses in the Collcctio7is of Dr. Vasey and Dr, 

 ?, nozv in the University Herbarium. (Rept. Dept. 



Nat. Hist. Northwestern Unl\^ 1889, pp. 17-19). 



Cherry Di 



A, L. M. Pammel. (Abstract, Proc. Iowa 



Acad. Sci. 1887-9, PP- 9^-94)- 



\^ 



Cip 



Septi 



de Mexico — Nota acerca de las, P. M 



(La 



Naturaleza (II) i. 294-296; translated from Bull. Soc. Bot, 

 France). 



Cotton Root- Rot, 



L. H. Pammel. (Bull. No. 7, Texas Agric. 



Exp. Sta., Nov. 1889. Pamph. 8vo. pp. 30, PI. I-V). 



Cyp 



Ozonium auricomnni is figured. 



Knees — The Causes of 



S. V. Clevenger. 



(Am. Nat. 



xxiv, 581). 



In this contribution to the much discussed question, the 

 author refers to a previous article in which the anchor and but- 

 tress theory of the angular roots was advocated, and suggests 

 that the strain which inevitably occurs at the angles would re- 

 sult in sap exudation and the piling up of indurated tissue such 

 as is found in the "knees." In support of this proposition he 

 quotes from Herbert Spencer's Principles of Biology as follows : 

 " Many commonplace facts indicate that the mechanical strains 

 to which upright gravity plants are exposed, themselves cause 

 increase of the dense deposits by which sifch plants are enabled 

 to resist such strains.'' 



Doubling of Floivcrs— Observations upon. Byron D. Halsted. 

 (Pop. Sci. Monthly, xxxvii. 374-381). 



