1 72 Intelligence a?id Miscellaneous Articles. 



a solid mass resembling white colophony ; it dissolves in aether, al- 

 cohol, and water, and acids decompose it completely ; the lithofellic 

 acid then separates entirely from the aqueous solution, and yields by 

 desiccation a white powder ; one part of soda saturates ten parts of 

 lithofellic acid. 



Ammonia dissolves lithofellic acid, and hydrochloric acid separates 

 it from solution, without any alteration, in the state of a white pow- 

 der : if the ammoniacal solution be evaporated in a salt-water bath, 

 decomposition also occurs, and the acid separates in white scales. 

 The soda soap of this acid gives with the salts of silver, mercury, 

 iron, lead, platina, lime, and barytes, compounds which are but 

 slightly soluble, or insoluble in water. 



Nitric acid, by its action on lithofellic acid, gives rise to a new 

 acid which is of a fine lemon-yellow colour. 



The calculus appeared to be almost entirely composed of lithofellic 

 acid, which seems to be of a peculiar and hitherto unknown na- 

 ture. 



It was analysed by MM. Ettling and Will, and found by one ana- 

 lysis, which did not differ much from two others, to consist of 



Carbon , 71-19 



Hydrogen 10-85 



Oxygen 17-96 



100- 

 They found the atomic weight of this acid combined with oxide 

 of silver to be = 4213 and 4276 in two experiments, and that of 

 the hydrate with one atom of water = 4327 and 4388. 



The formula which best accords with these results is C^- H"^ O^ 

 — C12 H'* 7 4- Aq, which gives in 100 parts, 



42 atoms Carbon 3185-86 71-43 



76 ... Hydrogen 474-22 1063 



8 ... Oxygen 800-00 17-94 



4460-08 100- 



The results of M. Gobel's analysis would give as the formula of 

 this acid, C^^ H^'' O 7 ; the composition of this acid therefore cannot 

 be considered as definitely fixed ; but its solubility in alcohol, its 

 facility of saponifying, the hardness of its crystals, its fusing point, 

 and the large quantity of oxygen which it contains, seem to the au- 

 thor to afford sufficient essential characters to distinguish it from 

 other fatty acids. — Journal de Pharmacie, Nov. 1841. 



ON A NEW ARRANGEMENT OF INSTRUMENTS FOR OBSERVING 

 TEMPERATURES AND THE DEW-POINT. BY MR. R. ADIE. 



To the Editors of the Philosophical Magazine and Journal. 



Gentlemen, 

 I respectfully submit for your examination the following account 

 of a new arrangement of meteorological instruments, which may be 

 said to be simply a compound of the two well-known instruments. 



