On procuring Crgstallisalions in the Dry Way. 311 



100 parts of this insoluble residuum, left by the ashes of the 

 blood, 



The Silex varies from 1 to 3 iu 100 

 The Lead „ 1 to 5 „ 



The Copper „ 0-5 to 2-6 „ 



The Manganese „ 10 to 24 „ 



After the determination, in this way rendered so easy, M. 

 Millon wished to examine whether the copper and the lead 

 were disseminated throughout the whole mass of the blood, or 

 whether, like the iron, they are assembled in the sanguineous 

 globules. 1 killogramme of coagulated blood, carefully sepa- 

 rated from the serum of numerous bleedings, yielded him 

 0^083 of lead and copper. 1 killogramme of serum sepa- 

 rated from the preceding coagulum, gave him only 0s'-003 

 of these two metals ; and M. Millon thinks that these three 

 milligrammes of lead and copper contained in the serum, 

 ought to be ascribed to the sanguineous globules dissolved or 

 suspended in the lymph. 



Then, he states in conclusion, the copper and lead are not 

 in a state of diffusion through the blood ; they are fixed with 

 the iron in the globules, and everything leads us to believe 

 that they share with it organization and life.* 



On procuring Crystallisations in the Dry TFay, as explained 

 in a Memoir laid before the French Academy of Sciences, 

 and reported on by MM. Beudant, Berthier, and Dufre- 

 NOY, By M. Ebelmen. 



The modern theories of geology, says M. Beudant, one of 

 the reporters, render it necessary to admit that a great part 

 of mineral substances are formed by fusion at a temperature 

 more or less elevated ; that is to say, that the rocks anciently 

 named prifuilive, formations of which we are now acquainted 

 with belonging to all ages, are the result, like all the matters 

 also which they contain, of a crystallisation by fusion. The 

 probability of this assertion has beensupported by experi- 



* From L'Institut, No. 732, January ISIS, p. 10. 



