Oct. 15. 1853.] 



NOTES AND QUERIES. 



373 



" T£ 5e jBAeVeis rb Kdp<pos to iv T(j? 6<p6a>^t^^ tov aScA- 

 <pov aov, tV 8e €f t^J ff^ u<pOaAfJ.ifi SoKhu oh Ka-ravous." 

 Matt. vii. 3. 



" Cum tua pervideas oculis mala lippus inunctis, 

 Cur in amicorum vitiis tarn cernis acutum, 

 Quam aut aquila, aut serpens Epidaurius ? " 



Hor. Serm. i. iii. 25. 



*''H vv^ irpoiKO^iv, fj 5e rifH€pa ij-yyiKtv." — liom. xiii. 

 12. 



*' 'AAA' "iofiey ' ixd\a "yap vv^ hverat, 4yyv6t 5' i]<is." 

 Horn. Iliad, x, 251. 



F. W. J. 

 Brighton. 



PHOTOGRAPHIC CORBESPONDENCE. 



Mr. Sissoii's developing Fluid. — Since I sent 

 you the new formula for Mr. Sisson's positive de- 

 veloper, which you published in Vol. viii., p. 301., 

 Mr. Sisson has written to me to say that if, in- 

 stead 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 sayg, come out beautifully. 



The formula then, as improved by Mr. Sisson, 

 is — 



Perhaps you will give your readers the benefit 

 of it in your next Number. Having tried it my- 

 self, I think they will be delighted with the beau- 

 tiful white silvery tone, without any metallic re- 

 flection, produced in pictures developed with it. 



J. Leachman. 



20. Compton Terrace, Islington. 



Dr. Diamond's Process for Alhumenized Paper. 

 — Photographers are under many obligations to 

 Dr. Diamond, particularly for the valuable in- 

 formation 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 pro- 

 cess 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. (with- 

 out 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. ? 



Is not the use of sel d'or subject to the objec- 

 tion that the pictures with which it is used are 

 liable to fade in time ? 



Dr. Diamond says that pictures produced by 

 the use of amm. nit. of silver are not to be de- 

 pended on for permanency. If this be so, it is 

 very important it should be known, as the use of 

 amm. nit. is at present generally recommended 

 and adopted. C. E, F. 



Mr. Lyte's New Process. — Although I presume 

 it is none of your affair what is said or done in 

 " another place," will you kindly ask Mr. Lytb 

 for me, if he will be so good as to explain the 

 discrepancy which appears between his "new 

 processes," as given in the Journal of the Photo- 

 graphic Society of Sept. 21, and " N. & Q." of 

 Sept. 10? In the former he says, for sensitizing, 

 take (amongst other things) iodide of ammonia 

 60 grains : in " N. & Q.," on the contrary, what 

 would seem to be the same receipt, or intended as 

 the same, gives the quantity of this salt one fourth 

 less, 45 grains — a vast difference. Again, in 

 the developing solution the quantity of formic 

 acid is double in your paper what it is in the 

 journal. 



I should not have trespassed on your space, but 

 would have written to Mr. Lyte directly, except 

 from the fear that some other unfortunate prac- 

 titioner may have stumbled over the same impedi- 

 ment as I have done, and may not have had 

 courage to make the inquiry, S. B. 



[Having forwarded this communication to Ma. 

 Lyte, we have received from that gentleman the fol- 

 lowing explanations of his process, &C.3 



The process which was published in the Photo- 

 graphic Journal was, I am sorry to say, not quite 

 correct in its proportions, on account of a mistake 

 in inclosing the wrong letter to the Editor ; but 

 the mistake will, I trust, be rectified by another 

 communication which I have now sent. 



The whole of the formulse, however, as given in 

 " N. & Q.," are quite correct. 



Let me now, however, trespass on your pages 

 by a few more answers to several other Querists, 

 and which at the same time may be acceptable to 

 some of your readers. 



1. The developing agents which are made with 

 iron are very applicable as baths to immerse the 

 plate in ; and the formic acid, from its powerful 

 deoxidizing property, renders the iron salt more 

 stable during long use and exposure to the air. 



2. In coating paper with albumen, if the upper 

 edge of the paper be sufficiently turned back, and 

 the paper be forced down sufficiently on to the 

 surface of the albumen, no bubbles will form ; and 



