464 Proceedings of Philosophical Societies. [Dec. 



economically obtained by employing potash in the process for 

 forming the ferrum preecipitatura. 



To attempt a definition of his remark on the preparations of 

 iron, would be Aquam arare, wherefore I shall be obliged, if 

 favoured with information, as to its abstract tendency. What 

 must be the inference of an assertion like the following ? " That 

 in the preparations of iron, there have been some alterations 

 which are to be considered as amendments ; but I am apprehen- 

 sive that the good which has been done is more than, counterba- 

 lanced by the omission of improvements, or the commission of 

 errors." Surely, if in the formula, that is, such as have been 

 altered, amendments have taken place, how can we ascribe to 

 the College a want of ability, or the commission of error ? 



My remark relative to the ferri subcarbonas, will be seen in 

 the note on sulphate of potash. 



The acidum aceticum fortius diluted with water does not 

 answer for the purpose of making the liquor plumbi subacetatis. 

 I have frequently tried it, and ever been unsuccessful, for as 

 soon as it assumes the density, as required in the Pharmacopoeia, 

 it becomes opaque, which cannot be removed by filtration. 



Anticipating the insertion of this paper in the Annals of 

 Philosophy, by the which an elucidation of the several paradoxes 

 complained of may be obtained,* 



I remain very respectfully, Gentlemen, 



Your most obedient servant, G. Whi ppl r. 



Article XIV. 



Proceedings of Philosophical Societies. 



ROYAL SOCIETY. 



This Society re-assembled on the 18th of November; when 

 Douglas C. Clavering.Esq.Capt. R.N. was admitted Fellow, and 

 the Croonian Lecture, by Sir E. Home, VPRS. was read : it 

 related to Mr. Bauer's discovery of nerves on both the fcetal and 

 maternal surface of the Placenta : a paper, by the same author, 



as also read, On the Changes undergone by the Ovum of the 

 wFrog, during the production of the Tadpole. We shall give 

 some account of these papers in the next number of the Annals. 



LINNEAN SOCIETY. 



The first meeting of this Society for the present session took 

 place on Nov. 2 ; when W. J. Broderip, Esq. was admitted 



• I shall probably take some notice of this communication in the next Number.— 

 R. P. 



