"For he hath said in his heart, Tush, I shall never be cast down there shall no harm happen unto me."--_Ps._ x. 6., &c. (See _Obadiah_ v. 3.: "Who shall bring me down to the ground?") So Niobe boasts: "Felix sum, quis enim hoc neget? felixque manebo. Hoc quoque quis dubitet? tutam me copia fecit. Major sum quam cui possit Fortuna nocere."--Ovid, _Met._ VI. 194. {373} "[Greek: Ti de blepeis to karphos to en toi ophthalmoi tou adelphou sou, ten de en toi soi ophthalmoi dokon ou katanoeis]."--_Matt._ vii. 3. "Cum tua pervideas oculis mala lippus inunctis, Cur in amicorum vitiis tam cernis acutum, Quam aut aquila, aut serpens Epidaurius?"--Hor. _Serm._ I. iii. 25. "[Greek: He nux proekopsen, he de hemera engiken]."--_Rom._ xiii. 12. "[Greek: All' iomen; mala gar nux anetai, enguthi d' eos]."--Hom. _Iliad_, x. 251. F. W. J. Brighton. * * * * * PHOTOGRAPHIC CORRESPONDENCE. _Mr. Sisson's developing Fluid._--Since I sent you the new formula for MR. SISSON'S positive developer, which you published in Vol. viii., p. 301., MR. SISSON has written to me to say that if, instead of the acetic acid, you add two drachms of formic acid, the new agent proposed by MR. LYTE, you certainly obtain the sweetest-toned positives he has ever seen. The pictures, he says, come out very quickly with it indeed; and with a small lens in a sitting-room he can in about ten seconds obtain the most wonderful detail. Every wrinkle in the face, and ladies' lace ribbons or cap-strings, he says, come out beautifully. The formula then, as improved by MR. SISSON, is-- Water 5 oz. Protosulphate of iron 1-1/2 drs. Nitrate of lead 1 dr. Formic acid 2 drs. Perhaps you will give your readers the benefit of it in your next Number. Having tried it myself, I think they will be delighted with the beautiful white silvery tone, without any metallic reflection, produced in pictures developed with it. J. LEACHMAN. 20. Compton Terrace, Islington. _Dr. Diamond's Process for Albumenized Paper._--Photographers are under many obligations to DR. DIAMOND, particularly for the valuable information communicated through "N. & Q.," and his obligingness in answering inquiries. I make no doubt he will readily reply to the following questions, suggested by his late letter on the process for printing on albumenized paper. Will the solution of forty grains of common salt and forty grains of mur. amm., _without the albumen_, be found to answer for ordinary positive paper (say Canson's, Turner's, or Whatman's)? and, in that case, may it be applied with a brush? Will the forty-grain solution of nit. sil. (without amm.) answer for paper so prepared? and may this also be applied with a brush? Should the positives be printed out very strongly? and how long should they remain in the _saturated_ bath of hypo.?