Since I received his letter I have been able to corroborate his testimony in favour of the stronger solution, and have much pleasure in sending you the formula for the benefit of your readers. It is this: 1½ drachms of protosulphate of iron in five ounces of water, 1 drachm of nitrate of lead, letting it settle for some hours; pour off the clear liquid, and then add to it 2 drachms of acetic acid.
_Mr. Stewart's Pantograph._--Will some of your photographic readers, who may know the proper size of MR. STEWART'S pantograph, give a detailed description of it? We should have focal length of lens, size of box, and the length of the sliding, parts of it. Cannot the lens be made fast in the middle of the box, provided the frames can be adjusted for different-sized pictures?
_George Browne of Shefford_ (Vol. viii., p. 243.).--I observe that in your interesting publication you have inserted the Query which I sent you long since. A somewhat similar Query of mine has already appeared, and been answered by your correspondents H. C. C. and T. HUGHES; the latter stating that my particulars are not strictly correct, inasmuch as the individual styled by me as "Sir George Browne, _Bart._," was in reality simple "George Browne, _Esq._" I admit this error; but if I was wrong, MR. HUGHES was so too, for George Browne's wife was Eleanor, and _not_ Elizabeth, Blount, as appears by his affidavit in the State Paper Office, wherein he deposes that he "had by _Ellinor_, his late wife, deceased daughter of Sir Richard Blount, eight sons, namely, George, Richard, Anthony, John, William, Henry, Francis, and Robert, and seven daughters."
1. George, created K. B. at the coronation of Charles II.; married Elizabeth Englefield; had issue two daughters; died 1678.
2. Richard, a captain in the king's army, 1649, and was dead in 1650.
3. Anthony, who was "preferred to the trade of a M_a_rchant," 1650.
4. John, a page to Prince Thomas, uncle to the Duke of Savoy; created Bart. 1665; married Mrs. Bradley; had issue.
5. William, had a "reversion of a copyhold in Shefford."
6. Henry, died unmarried, 1668; buried at Shefford.
In that year (1651) Henry, Francis, and Robert were living with their guardian, Mr. { 302} Libb, of Hardwick, Oxon; and soon afterwards we find them placed under the care of a clergyman at Appleshaw. But here we seem to lose sight of them altogether.