24 ANNUAL OF SCIENTIFIC DISCOVEEY. 



shall be equal in the amount of heating power, without liability to injure 

 metals in contact with it. 



For an account of the processes employed in obtaining different products, as 

 parrafine from shale, and the uses to which they may be applied. 



For an account of the economic manufacture of color by electricity. 



For the preparation of any color, applicable to the japanned surfaces of 

 papier mache, that shall be free from the brightness (or glare) of the varnished 

 colors now used, but yet possess the same degree of hardness and durability. 



For the preparation of light colors to be used in enameling or japanning 

 slate or iron, that will stand the action of heat from the fire without blister- 

 ing or discoloration, and be sufficiently hard to resist scratches. 



For an account of the processes involved in the preparation of animal 

 charcoal, and its recent applications to manufacturing and other purposes. 



For the best essay on the theory and practice of fermentation, particularly 

 as applied to the art of brewing, so as to modify, or altogether dispense with 

 the intermediate process of malting. 



For a substitute for, or preparation of, yeast for raising bread, that may be 

 preserved for use, better than any hitherto generally known. 



For improvements in the processes for preserving animal food, and for pre- 

 venting salted and other provisions from becoming rancid, with an account of 

 methods at present employed. 



For the discovery, and production to the Society, of any new substance 

 which can be successfully used as a substitute for gutta percha. 



For the production of a perfectly colorless copal varnish, not liable to injure 

 the colors over which it is applied. 



For the production of a colorless gold size, not liable to affect the delicate 

 tints with which it is mixed when used to facilitate their drying. 



For a pure colorless oil, suitable for artists; or for a decolorizing agent for 

 linseed oil, which will leave its other properties unimpaired. 



For the production of cheap purple and yellow lakes, of good quality, suit- 

 able for carriage-builders, etc., and not liable to fade or change color. 



For the importation of, at least, two tons of any new vegetable fiber, appli- 

 cable to all the purposes for which flax or hemp is now used, and equally 

 strong and durable. 



For the discovery of an economic and effective substitute for the teazels 

 used in raising the face, or nap, of cloth. 



For a method of preparing an engine size for the use of paper-makers, 

 superior to any now in use. 



For the best account of the mode in which size from sea-weed is prepared 

 and used by the Chinese. 



For the best series of usoful products from sea-weeds, the methods of 

 obtaining them, and the* purposes to which they are or may be applied. 



For an effectual method of utilizing the sewerage of towns. 



For an account of the mechanical means at pivsi-nt in use to facilitate tho 

 operation of packing goods, whether by hydraulic presses or otherwise. 



For the best form of street goods wagon; the improvements required are a 

 lower center of gravity, and a ready means of discharging heavy packages. 



