458 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



by Smith shows that it contains a great variety of substances, 

 including only a small percentage of theine. In this respect 

 it is about equal to the mate, or Paraguay tea, but far below 

 coffee and tea in its percentage of valuable ingredients. 17 

 A, September 1, 1874, 132. 



COVER FOR WATER-COOLERS. 



A cylindrical cover of wool felt, or similar material, hav- 

 ing a wooden top, with a handle attached, the whole covered 

 externally and internally with flannel and coated with var- 

 nish or shellac, is made to slip over the vessel to be kept 

 cool. A rubber ring around the open bottom serves to ad- 

 just the cover to any inequalities of the vessel. 13 C, Feb- 

 ruary 15, 1874, 271. 



RENDERING FADED MANUSCRIPT LEGIBLE. 



According to the Revue Industrielle the best method of 

 rendering faded manuscript legible consists in moistening 

 the paper first with water, and then dipping it in a solution 

 of sulphohydrate of ammonia. The ink is said to reappear 

 immediately, becoming very distinct, and remaining perma- 

 nent on parchment. Certain parchments treated in this way 

 ten years ago still maintain their legibility. This result is 

 due to the fact that, by the action of sulphohydrate of am- 

 monia, the iron which enters into the composition of the ink 

 is transformed into a very black sulphuret. 13 J3,July 31, 

 1874, 143. 



EFFECT OF WASHING UPON VEGETABLES. 



The peculiar flavor of all vegetables is affected by washing, 

 but that of the kinds used for salads is especially impaired 

 by water. These should, therefore, never be washed unless 

 necessary, and then only immediately before preparation for 

 the table, and as rapidly as possible, all the water being re- 

 moved by shaking or whirling in a net o-r colander. 9 (7, 

 September, 1874, 134. 



