546 TRANS. ST. I.OUIS ACAD. SCIENCE. 



died by Treviranus,^ Bischoft",^ Brongniart/° Harz/^ Wiesner/^ 

 and Fliickiger & Haubury.^^ 



Alcuritcs has been studied by Wichmann/ •* yatropha curcas 

 has been studied by Hanausek/'*'' and Croton iebi/erzi??t^ ^^' hy 

 Morel. 



A study of the seed-coats of the genus Euphorbia has brought 

 out a wholly unlooked for feature, namely, the presence of mu- 

 cilaginous walls with spirals, in the seeds of some of the species. 

 This seems not to have been observed before, although Harz^^ 

 doubtfully refers to mucilage in the third layer of the outer cell- 

 coat in E. Lathyris. 



A few words about the literature concerning mucilage in the 

 seeds of various genera will not be out of place, as it is of such 

 common occurrence. This substance occurs in Orders in 

 no way related, as in Rosacea: (^Pyrus \_Cydonia'\ vulgaris), 

 Cniciferce {Brassica., Lepidium, Teesdalia, &c-)» Linacecc 

 {^Lin7im), Plantagitiaceiv {Plantago), Poleino?tiacec€ (^Polemo- 

 nium, ColIoi)iia~), Acauthacecv (^Acanthodium^ Huellia)^ &c. 



In 1S55 Cramer^^ made a valuable contribution, from a chem- 

 ical as well as a microscopical standpoint, on the subject of muci- 

 lage in the seeds of A i u u ;u and Cydonia. Kiitzing^^had also 

 previously studied them. The seeds of quince have long been 



8. Wie entstelit die sogenannte Oherhaut der Sainenschale( Testa seminis?). Sitz. d. K- 

 Bayr. Akad. d. Wissenschaften zu Munchen, Tahr. 1863, vol. ii. 



9. Handbuch der Bot. Terminologie, i. 1S33, Plate xliii. Figs. 1S72 and 1S73A. 



10. Ann. Sci. Nat., ist Series, vol. xii. p. 26S. 



11. L. c. p. 833, Fig. 48. 



13. RohstofFe des Prtanzenreiches, p. 721. 



13. Pharinacographia : A History of tlie principal Drugs ofVegetable Origin metwith 

 in Great Britain and British India. London: Macmillan & Co., 1S79, p. 565-69. 



14. Anatomic des Samens von Aleurites triloba, Forst. Verhandl. d. Zoolog.-Botan. 

 Gesellschaft, Vienna, 1S79, p. 41 1 ; E. Pfitzer, Just, Bot. Jahresb. 18S0, p. 35 ; Bot. Central - 

 blatt, vol. i., iSSo, p. 4S6. 



14a. Anatomisclier Bail der Samen von Jatropha Curcas, L. (Curcas purgans, Eudl. ) 

 Zeitschr. des Allg. Oester Apotheker Vereins, 1S78, p. 173. 



14&. Contribution a I'etude de la graine du Croton sebiferum. Nancy, (Crepin Le- 

 blond), 34 pp.; Just, Bot. Jahresb. 1SS6, p. 911. 



Fliickiger Just Bot. Jaliresb. 187S, p. ii3i. 



15. L. c, p. S32. 



16. Ueber das Vorkommen und die Enthstehung einiger Ptlanzenschleime. — Pflanzen- 

 physiologische Untcrsuchungen von Carl Nageli und Carl Cramer, 1855, Heft iii. Plates 

 xxvii.-xxxiv. p. 32, See Plate xxviii., f. i-io. 



17. Grundziige der Philosophischen Botanik, Cydonia, Plate iv., Figs. 4-6. 



