SIR KNIGHT MILTON E. PEASE, of Suffield, Connecticut, wants the address of some firm where he can get good supplies, and also wishes the formula for a good developing solution. Sir Knight Milton will find reliable firms in Boston and New York, any one of which will send price-list on application. The editor is not familiar with firms in Springfield, Connecticut, but would advise sending to some town near Suffield, as the charges are much less for transportation. A good developing solution is made as follows: Solution No. 1. Water, 10 oz.; sulphite of soda, 2 oz.; eikonogen, 165 grs.; hydroquinon, 80 grs.; and add enough water to make the solution up to 8 oz. Solution No. 2. Water, 10 oz.; carbonate of potassium, 1 oz.; sodium carbonate, 1 oz.; and enough more water to make the solution up to 16 oz. For developing take 1 oz. of No. 1, 1 oz. of No. 2, and 4 oz. of water. SIR KNIGHT EDWIN V. GRISWOLD asks what kinds of trays to use for developing, fixing, and toning. The best developing trays are made of rubber, but celuloid makes a very good tray. An amber glass tray is the best for a fixing-tray, as, being so unlike the other trays, one never mistakes the hypo-tray for any other. A white porcelain tray is usually chosen for a toning-tray. A CORRESPONDENT OF ENGLEWOOD, N.J., who does not sign name, asks a good and cheap way to make a developer. Our correspondent will find his question answered in the answer to Sir Knight Milton Pease in this number, and also at the beginning of this column. [Illustration: STAMPS] This Department is conducted in the interest of stamp and coin collectors, and the Editor will be pleased to answer any question on these subjects so far as possible. Correspondents should address Editor Stamp Department. The new U. S. Postage-due stamps are printed in aniline colors, and if wet the colors run badly. Do not soak any of them, as that would ruin them. The higher values of these stamps (30 and 50 cents) are still scarce, as many post-offices had large stocks of the old issue, or of the lower values (1, 2, 3, 5, and 10) of the current issue. Proofs and essays of U. S. stamps are advancing in value rapidly. A few years ago they brought nominal prices only. Unused U. S. stamps, with the original gum well centred, are worth from 30 per cent. to 50 per cent. more than when gum has been soaked off, or when not evenly centred. F. BOGGS.--Write to any of the firms mentioned in our advertising columns. E. S. D.--Dealers ask 20c. for the 1835 dime. J. S. POWELSON.--The 2c. 1869 can be bought for 8c. RUTH E. CHAMBERLIN.--The 1804 half-cent is quoted at 15c. GLEN CARTER.--"Helvetia" stamps are those of Switzerland from 1862 to date. They are worth from 1c. to $1 each, according to scarcity.