432 Scientific Proceedings, Royal Dublin Society. 



Similar differences have been established for the sap extracted by means 

 of liquid air from the roots, rhizome, and leaves of Iris germanica. They, too, 

 liave been found to be in the same sense as the differences in the saps from the 

 untreated organs. The same holds good in regard to those of the I'oots and 

 leaves of Eucalyptus globulus. It was also observed that the sap of the leaves 

 of Medera Helix grown in a south aspect had a greater depression than that 

 of leaves in a north aspect, quite irrespective of which of the two 

 methods of extraction was employed in the pair of comparative experiments. 

 Of course the absolute values were very different. These results and others 

 are recorded in a subsequent paper. 



BlBHOGRAPHY. 



1. ANDufi, Q-. : Sur la composition des liquides qui ciroulent dans le 



vegetal. Oomptes Rendus, 1906, 142, p. 106. 



2. Sur la composition des sues v^getaux extraits desracines. Oomptes 



Rendus, 1906, 143, p. 972. 



3. — — Sur la composition des sues v^g^taux extraits des tiges et des 



feuilles. Oomptes Rendus, 1907, 144, p. 276. 



4. — — Sur la migration des principes solubles dans le vegetal, Oomptes 



Kendus, 1907, 144, p. 383. 



5. Atkins, W. R. Gt. : Oryoscopic Determinations of the Osmotic Pressures 



of some Plant Organs. Proc. Roy. Dubl. Soc, vol. xii (N. S.), No. 34, 

 1910, p. 463 ; and Notes from the School of Botany, Trinity Oollege, 

 Dublin, 1910, vol. ii, No. 2, p. 84. 



6. Oavara, F. : Influenza di minime ecceziouali di temperatura suUe piante 



deir Orto botanico di Oagliari. Bol. Soc. Bot, Italiana, 1901, p. 146. 



7. Risultati di una serie di ricerche orioscopiclie sui vegetali. Con- 



tribuzioni alia biologia vegetale, iv, 1905, p. 1. 



8. Dixon, H. H. : On the Osmotic Pressure in the Cells of Leaves. Proc. 



Roy. Irish Acad., vol. iv, ser. 3, 1896, p. 61 ; and Notes, Bot. Sch. 

 T.C.D., vol. i, No. 2, p. 44. 



9. A Thermo-electric Method of Cryoscopy. Proc. Roy. Dubl. Soc, 



vol. xiii (N. S.). No. 4, 1911, p. 49; and Notes, Bot. Sch. T.C.D., 

 vol. ii, No. 3, p. 121. 



10. Dixon, H. H., and W. R. G. Atkins. On Osmotic Pressure in Plants. 

 Proc. Roy. Dubh Soc, vol. xii (N. S.), No. 25, 1910, p. 275 ; and 

 Notes, Bot. Sch. T.C.D.. vol. ii. No. 2, p. 47. 



