318 Intelligence and Miscellaneous Articles. 



A." Solution of Chlorophyll. 



Deflection. 



1. Alum plate, anterior 10 



„ ,, posterior 10 



2. ,, ,, anterior 6 



,, ,, posterior 6 



3. ,, „ anterior 13 



,, ,, posterior 13 



4. Violet glass, anterior 20 



,, „ posterior ...... 20 



B. Rochleder's .ZEsculine red. 



5. Alum plate, anterior 6 



,, ,, posterior 6 



C. Ground- glass plate. 



6. Alum plate, anterior 3 



,, „ posterior 3 



Hence in both fluorescent liquids the thermoscopic action of the re- 

 flected ray was the same whether the interposed plate was in the incident 

 or reflected light. As it can scarcely be assumed that in all cases a=/3, 

 the less so that the result was the same even when glasses of different 

 colours were interposed, it is clear that, though it cannot perhaps be 

 maintained that no obscure radiation is produced by fluorescence, yet 

 it is so small as to produce no appreciable thermal action — therefore 

 that if/*' is not =0,it can have but an extremely small value. In most 

 cases I am inclined to the first assumption, thaty = ; only in the 

 case of chlorophyll- solution the case is doubtful, inasmuch as f 

 might there have a very small value scarcely differing from zero. 

 For if the composition of the mixture of colours produced by fluores- 

 cence be prismatically analyzed, in no case within my knowledge 

 does the visible radiation extend to the extreme limit of the red, in 

 many cases scarcely beyond the orange, and seldom further than into 

 the neighbourhood of Fraunhofer's line C ; hence it is not to be 

 expected that obscure rays of greater wave-length than the extreme 

 red should occur in appreciable intensity.— -Poggendorff 's Annalen, 

 No. 8, 1866. 



ON THE DYNAMIC THEORY OF DEEP-SEA TIDES. 

 BY E. J. STONE, ESQ. 



In the March Number of the Philosophical Magazine is an interest- 

 ing paper by Mr. D. D. Heath, u On the Dynamical Theory of Deep- 

 sea Tides, and the Effect of Tidal Friction." On page 185 Mr. 

 Heath states as follows : — " The Astronomer Royal having (by an 

 oversight, I venture to think) convinced himself that no effect on the 

 earth's rotation can be produced by those forces of the first order, 

 with friction, of which his own canal theory took account, seeks for 



