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Mc Collum, E. V., N. Simmonds and W. Pitz. 1917. The supplemen- 

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Nordhausen, M. 1917. Blattepiderrais und Lichtperception. Eine Ent- 

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Onken, A. 1917. Ueber die Bedeutung des Kalziums im Leben der 

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Plätzer, H. 1917. Untersuchungen über die Assimilation und Atmung 

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Ravenna, C. 1916. Sulla nutrizione della piante verdi per mezzo di 

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Tröndle, A. 1916. Ueber die diosmotischen Eigenschaften der Pflan- 

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Berry, E. W. 1917. A middle eocene Goniopteris. (Bull. Torrey bot. 

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Berry, E. W. 1917. A middle eocene member of the „Sea Drift". 

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Britton, E. G. 1915. A new American fossil moss. (Bull. Torrey bot. 

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Broekmann-Jerosch, H. 1916. Weitere Gesichtspunkte zur Beurtei- 

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Bureau, E. 1917. Bassin de la basse Loire. Fase. 2. Description des 

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Cantrill, T. C. 1917. The geology of the forest of Wyre coal field. 

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Dixon, E. E. L. 1917. The geology of the Titterstone Clee Hill coal 

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Jeffrey, E. C. 1917. Petrified coals and their bearing on the problem 

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Kidston, R. 1917. The forest of Wyre and the Titterstone Clee Hill 

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Kidston, R. 1917. The fossil plants collected from the core of the 

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Kidston, R. 1917. The fossil plants of the forest of Wyre coal field. 

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Kidston, R. 1917. The fossil plants of the Titterstone Clee Hill coal 

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Kidston, R. and W. H. Lang. 1917. On Rhynia Gwynne-Vaughani. 

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