370 Miscellanies. 



symmetry and analogy. For when tl>e substance is indicated by 



2AS + C^S% there is no longer any obvious identity with 2 A -|- 



3C-|-4S, which is the real result of the analysis. 

 Substance. Berzelius'' JVotation. WhewelVs JYotation. 



Phos.lime,C=^P2 3C + 2P 



Felspar, KS^ + SAS^ (k-[-3S)+3(A+3S) 



Alum, K's^+2'AS2+48-Aq. 2-(A+3S)+K+28+48 : Aq. 

 Coefficients are, in all cases, used instead of indices. — Id. 



9. Preservation of Blood. — Sugar refiners and others are often 

 inconvenienced by the difficulty of obtaining blood at the time when 

 it is required for use. M. Toursel has endeavored, in part, to re- 

 move this difficulty, by proposing a method of preserving this agent 

 for some time without injury. It consists in putting the blood into 

 bottles or other vessels with very narrow mouths, and being careful 

 to fill them up to the neck 5 a layer of oil, to the depth of at least 

 half an inch, is then put upon it, to cut off communication with the 

 atmosphere, and the whole is left to itself. M. Toursel states that 

 he has in this manner preserved blood, wiUi all its physical and chem- 

 ical qualities, from the first of December, 1827, to January, 1829. 



10. Presence of Manganese in the Blood. — (Prof. Wurzer, of 

 Marburg.) — In some analyses of human blood, according to Engel- 

 hart's method by liquid tests. Prof. W. was led to suspect that, be- 

 sides the usual results, he had also obtained a small quantity of man- 

 ganese ; not being, however, quite sure of the correctness of his anal- 

 yses, he was induced to repeat them in the following manner : — The 

 blood, which had been obtained by venesection, on the day before 

 the experiment was ignited in an open crucible, the incinerated mass 

 oxidized by nitre, and then diluted with water ; the residuum was 

 dissolved in muriatic acid, and the iron precipitated from the solution 

 by succinate of ammonia. As the precipitate contained also some 

 phosphate of lime, it was again ignited, and then dissolved in muri- 

 atic acid ; the phosphate of lime was separated from the solution by 

 alcohol, the excess of the latter expelled by heat, and the iron pre- 

 cipitated by ammonia. By boiling the filtered liquid with carbonate 



