278 Professor Ow^en on Metamorphosis and Metagenesis. 



the Aphis, the Medusa, the Polype, and the Entozoon. The 

 cause is the same in kind though not in degree, and every 

 successive generation, or series of spontaneous fissions, of 

 the primary germ-cell must weaken the pollen-force trans- 

 mitted to such successive generations of cells. 



The force is exhausted in proportion to the complexity 

 and living powers of the organism developed from the 

 primary germ-cell and germ-mass. It is consequently longest 

 retained and furthest transmitted in the vegetable kingdom ; 

 the zoophytes manifest it in the next degree of force ; and 

 the power of retained germ-cells to develope a germ-mass 

 and embryo by the remnant of the pollen-force which they 

 inherited, is finally lost, according to present knowledge in 

 the class of Insecta and in the lower Mollusca. 



Chemical Examination of Specimens of Purple Copper Ore and 

 Copper Pyrites, with Pemarks on their Constitution, By 

 Mr Da VIET Forbes, of the Espedal Copper "Works, Norway. 

 Communicated by the Author. 



Although the two ores of copper which form the subject 

 of the present notice have frequently been analyzed, still the 

 following details may be considered not entirely devoid of 

 interest, both as confirming the results of previous chemists 

 and as probably also assisting to determine their chemical 

 constitution, which has often been a matter of discussion. 



The ores in question were analyzed at the request of his 

 Royal Highness the Crown Prince of Sweden and Norway, 

 and obtained from the Gustav and Carlstad copper mines, 

 situated in the county of Jemtland in Sweden. 



I. Octohedral or Purple Copper Ore. — Free from gangue, and 

 apparently in a quartzy matrix. Metallic lustre ; bronze 

 colour when recently fractured, but soon tarnished to a fine 

 purple or purple-red tint. Streak greyish black. Fracture 

 conchoidal, brittle, and when pulverized gave a bronze- 

 brown powder. Hardness about that of fluorspar, or 4° of 

 Mohs' scale. The specific gravity taken at 60° F. was 4-432, 

 water being 1. The specific gravity generally assigned is 



