4 BOTANICAL PUBLICATIONS OF THE RAY SOCIETY. 



In Course of Publication. 



A Monograph of the British Desmidiacese. After Yol. IV 

 by Prof. Gr. S. West. 



The Principles of Plant-Teratology. By W. C. Worsdell. 

 Yol. I, containing Non- Vascular Plants, and the Root, Stem, 

 and Leaves of Vascular Plants, for 1915. Vol. II, containing 

 the Flower, and concluding the work, for 1916. 



Preparing for Publication. 

 The British Characeas. By James (troves. 



Prices, and a complete list of the Society's publications, will be for- 

 warded on application to the Secretary, John Hophinson, Weetwood, 

 Watford. 



