HARDWICKE'S SCIEN C E- G O S S I P. 



39 



Fie. 41. Extraction of Meta!s, from Munster's "Ciii-nir grape,'' a.o. 1552. 



how this then supposed fish is 

 amply provided wilh mammillary 

 glands ! In the back-ground we 

 have incidentally introduced some 

 of the dangers to which the frail 

 whaling-vessels of the time were 

 exposed. An infuriated whale is 

 seen capsizing a ship. In fig. 41 

 another busy scene is represented, 

 copied from the same work, show- 

 ing men engaged in extracting 

 metals from the ores. In some 

 of the small washings carried on 

 by miners in Derbyshire on their 

 own account, we have almost the 

 counter-part of this picture. 



Where an outlay of capital is required, and 

 cannot be obtained, it is surprising how long primi- 

 tive appliances maintain their ground. M. Lacroix's 

 magnificent work is crowded with instances of this 

 kind, and every now and then we come across an 

 outlier that has remained in the same condition for 

 five hundred years at least. We have said enough, 

 however, to indicate to our readers the high merit 



Fig. 42. Horse-baiting, from a I3th century MS. in the British Museum. 



and general interest of the book we have briefly 

 brought before their notice. 



How TO Polish Shells.— Having some "green 

 snail" and " Manilla pearl" shells, and wishing to 

 polish them myself, I should be greatly obliged by 

 being informed through your columns as to the 

 best books to be bad on the subject of shell polish- 

 ing. — Querens. 



