APPENDIX. 943 



RELICS. 



2397. Frame containing proofs in John Dalton's hand- 

 writing of part of the " New System of Chemistry." Vol. II. 

 Part I. Pages 347, 349, and 352. Professor Roscoe, F.R.S. 



2409. Apparatus by which the body in the atmosphere which 

 acts upon Schonbein's test-papers was first certainly proved to 

 be identical with ozone. Dr. Andrews, F.R.S. 



Atmospheric air, in fine weather and acting freely upon the test-papers, was 

 drawn steadily through a glass globe, capable of being heated to 300 c., 

 when all chemical reactions disappeared, which could only occur in the case 

 of ozone. 



245Gb. Apparatus for simultaneous production of hydrogen, 

 carbonic acid, and sulphuretted hydrogen. 



P. JVaage, Professor of Chemistry and Director of the 

 Chemical Laboratory at the Royal University of Chris- 

 tiania, Norway. 



The apparatus consists of a reservoir for hydrochloric acid of 10-15 per 

 cent, strength. At the bottom of this reservoir are three apertures through 

 which it is connected in the usual manner by glass tubes and stopcocks with 

 three cylindrical jars, on filled with zinc, the second with marble, and the 

 third with sulphide of iron. Beneath each of these, and communicating with 

 the sewers , is another reservoir into which the solutions of chlorides are 

 gathered. The three gases generated are conducted through wash bottles 

 furnished with stopcocks of glass ; when these are turned off the several gases 

 and the solutions of chlorides will pass through the lower reservoirs into 

 the sewers. 



The apparatus once fitted up is always ready for use, and all superfluous 

 gas is completely led away without producing any smell in the room where 

 the apparatus is fixed. 



247 6 a. Chrysoidine, a new basic orange dye for silk, 

 wool, cotton, leather, &c. Manufactured by the exhibitors. 



Williams, Thomas, and Dower. 



Chrysoidine is, according to quality, the sulphate or hydrochlorate of a new 

 bi-acid base, belonging to the benzene series. It is a valuable orange-yellow, 

 and owing to the readiness with which it crystallizes, can be obtained in a 

 state of perfect purity. Except phosphine, it is the only basic yellow dye 

 known, and as it is the result of a direct process (not a secondary product) 

 it can be obtained at a much lower price than phosphine, which it equals, and 

 in some of its applications surpasses in strength and beauty of shade. It dyes 

 in neutral or slightly basic baths, and has a great affinity for silk, wool, and 

 even for unmordanted cotton. Mordanted cotton is dyed a yellow or orange 

 shade according to the mordant employed. It combines readily with magenta 

 and other red colours, giving rise to very clear and beautiful scarlets. The 

 chrysoidine was discovered quite recently in our laboratory by Dr. Otto N. 

 Witt. 



274Oa. Rudorffs Apparatus for determining the car- 

 bonic acid in illuminating gas. 



W. J. Rohrbeck and F. Luhme and Co., Berlin, Dr. Herm. 

 Rohrbeck. 



