Physiologie. — Palaeontologie. 219 



addition of protein or protein-derivatives; and the only possible 

 source is the pods, which, therefore, appear to act as reserve-hol- 

 ders tor the N-supply to the seeds under special conditions. 



V. The Occurrence of Potassium nitrate in Plants. The oeeur- 

 rence of an unusually largo amount of potassium nitrate in the 

 leaves of Solandra grandiflora, 2-01% of the plant dried at 100- C. 

 is recorded. The number of plants which are known to störe up 

 nitrates as a reserve is small, and a list of the most important of 

 these is given with references. The significance to the plant of this 

 salt and the present views as to its röle in metabolism are described. 



Author's Abstract. 



Hartz, N., Bidrag til Danmarks tertiäre and diluviale 

 Flora. [Contributions to the Tertiary and Pleistocene 

 Flora of DenmarkJ. With an English summ. Diss. 292 pp. 13 pl. 

 Copenhagen 1909.) 



The earlier literature concerning this objeet is cited in the in- 

 troduetion. Among the Tertiary deposits the Cementstone is first 

 mentioned, and it is pointed out that the leaves of Cocculites Kanei 

 Heer most problably refer these deposits to the Eocene. Two new car- 

 polites are described from here: Carpolithes Furensis and C. sphericus, 

 the latter of these having a striking resemblance with the fruits of 

 recent Cinnamomum. A detailed description is now given of the 

 Brown coal layers in Jutland. The higher plants from here are 

 rather few; the greatest interest is presented by the Conifevae, of 

 which it has been possible to identify Pinus Laricio Thomasiana 

 Heer and Sequoia Langsdorfii Brongn. The leaf-trees are represented 

 by Laurus tristaniaefolia Web. and species of Alnus, Betula, Tilia 

 and Ulmus. Hydrocharis tertiavia is described as a new species as 

 well as the following carpolites: C. Dalgasii, Yohnstriipii nyssoides 

 and two others, designed as A and B. As to the formation of the 

 deposits the eider drift-wood theory can not be upheld; the author 

 has always found a distinet freshwater gytje under the coal layers, 

 and he means that the coal has the same connection to the named, 

 gytje as the peat layers to the underlying gytje in the postglacial 

 wood-bogs. 



Of the Pleistocene deposits the Amber-pine-beds (dark-coloured 

 beds in fiuvio-glacial sand containing a mixture of Tertiary and 

 Quaternary plant-remains) are first described. The plant-list enu- 

 merates more than 50 phanerogamic Pleistocene species, among 

 which the author points out as characterizing: Carpinus betulus and 

 Stratiotes aloides; the Tertiär}'' element contains but 13 species, for 

 the most part new-described carpolites {Carpolithes Hafniensis, le 

 Mairii, Ordrupensis, Rosenkjarii, Steenslrupii, Oestrupii). As a fact 

 of phylogenetic interest the author states that the seed of Stratiotes 

 aloides of the amber-pine-beds (S. aloides f. intermedia Hartz) has a 

 more tuberculated surface than the typical interglacial and recent 

 seed and thereby forms a transition to the tertiary 5. Kaltennord- 

 hemensis (Zenk.). 



After this a detailed description is given of the Interglacial 

 deposits. By earlier investigations of the author it has been shown 

 that Jutland contains a number of fossileferous interglacial la}^ers. 

 From X localities the occurrence of diatom-earths was stated, and 

 in a preliminary report the author had published the discovery of 

 characteristic interglacial fossils in several bogs in the neigbourhood 



