210 



MICEOSCOPICAL SECTION. 



February 17th, 1862. 



Professor Williamson, F.R.S., President of the Section, 

 in the Chair. 



Soundings were acknowledged from Captain W. B. Hall, 

 of the P. and O. S. S. " Tagus;' taken off Ushant, Coast of 

 France, and from Captain J. R. Husband, ship "Florence 

 Nightingale,^^ taken off the Coasts of Patagonia and Tierra 

 del Fuego. 



Professor Williamson called the attention of the section 

 to the new rotifer (Cephalosiphon Limnias), recently dis- 

 covered by Mr. H. J. Slack, in a pond at Hampstead, and an 

 account of which appeared in No. 1 of the Intellectual 

 Observer of the present month. Attention was specially 

 directed to the fact, that the animal only possesses one of 

 those organs that have been designated "respiratory tubes," 

 '^calcars," and "tactile organs;" whereas, the Floscularian 

 Rotifera, when furnished with them, have two. It remains 

 to be ascertained from a study of the embryo, whether this is 

 the typical condition in the Cephalosiphon, or whether there 

 were primarily two, the missing one having been suppressed 

 during the development of the embryo, as sometimes occurs 

 amongst higher animals. 



The Secretary read a Paper, by Mr. Thomas Davies of 

 Warrington, on Crystallisation. 



Mr. Davies treats more particularly upon some of the 

 double salts, which show beautiful combinations of form and 



