('(dentin chloride, both hydrated and anhydrous, grows 

 rapidly. At first usually slender thread-like shoots ; after 

 a time the solution beeoraes milky, and a white feathery 

 precipitate separates, gradually becoming thicker and 

 settling down, lint the threads may remain distinct. 



Magnesium is disappointing. One would expect it to 

 grow well, but it rarely 'lots more than give off a few short 

 shoots, the rest merely swelling up. Both the sulphate 

 and the chloride have been tried. 



both gave a good growth, about two to three inches long. 

 Zirconium rather thick. In a taller tube it did not grow 

 so well. Cerous sulphate gave one or two feeble, pale 

 brown shoots. 



Consideration of Results. -Having summarised the 

 results obtained, we may now consider whether there is 

 any reasonable explanation of the phenomena observed, 

 and if there are any similar growths obtainable in other 

 ways. We have to account, if we can, for the growth, 

 against the action of gravity, of long and often very slender 



in many cases, for apparently an indefinite time, at least 

 for several years, if kept in a stoppered tube, without 

 apparent change. Moreover, some of the growths, and 

 especially the slender ones are very firm, so that the tubes 



