CONTENTS (continued). 



PACE 



The External Features in the Development of Lepidosiren paradoxa, Fitz. 



By J. G-baham Kebb. Communicated by A. Sedgwick, F.K.S. . . 160 



The Thermal Expansion of Pure Mckel and Cobalt. By A. E. Tutton, B.Sc. 



Communicated by Professor Tildbn, D.Sc, F.R.S 161 



On the Presence of two Vermiform Nuclei in the Fertilised Embryo-sac of 

 Lilitm Martagon. By Ethel Sabgant. Communicated by Dr. D. H. 

 Scott, F.E.S 163 



NOTICE TO AUTHORS. 



Authors of Papers intended for the ' Proceedings ' or 1 Philo- 

 sophical Transactions ' are urgently requested to send in all 

 drawings, diagrams, or other illustrations in a state suitable 

 for direct photographic reproduction. 



