332 



THE ROYAL SOCIETY OF CANADA 



The object of exhibiting these models to the Royal Society was 

 solely to inform others about what has proved to be an exceptionally 

 good aid to lectures on this subject, in particular to classes studying 

 molecular physics, and to students in organic chemistry becoming 

 acquainted with this new work for the first time. 



The simple method of using solid rubber balls and needles, which 

 may be obtained cheaply and assembled readily, appears to be novel, 

 but the writer does not in any way suggest that models of this type 

 are new. 



Model of Napthalene Crystal Cell 



[Shaw] 



A Note on the Comparison of Some Formulae for the Prediction of 



Estuary Tides 



By A. N. Shaw, D.Sc. 



Presented by A. S. Eve, D.Sc, F.R.S.C. 



Abstract 



A brief comparison was submitted of the equations for the 

 relationship between tides at various places on an estuary, as deter- 

 mined (1) on the basis of the observed "projection" relationship, 

 (2) on the basis of some theoretical solutions. 



The paper was not submitted for publication as it will be in- 

 corporated with the complete report on this work. 



