100 PHILOSOPHICAL NOTES ON 



to fine iron filings when moved in the atmosphere of the pole of a 

 magnet. 



If we consider the cell as a sort of vegetable crystal, we may 

 perhaps obtain a clue to the disposition of vegetable parts as a 

 parallel to the crystalline parts of minerals. 



I admit that this would give a very inadequate notion of 

 how vegetable forms were originally brought about, but a peg 

 to hang a notion upon is, perhaps, better than no peg at all. 



Whatever all this may mean, one frosty morning on the 

 street pavement, where, in the previous evening, there had been 

 a film of water I observed the following form (Fig. 9). On 



rig. 9. Form of ice crystallization seen on street pavement on 

 12 March 1891. 



another frosty morning, on the glass of a shop ^vindow, which 

 had been bedewed the previous night on its inner surface, I 

 observed another form of the same crystalline genus, but of a 

 different species, which I give in Fig. 10. I only wish I could 

 have photographed these interesting forms, which are here 

 inadequately copied. 



