of processes in the Fine and Useful Arts. ^45 



add 10 grammes of animal matter, (M. Braconnot used pairings 

 of hides,) properly divided, and 5 grammes of flour of sul- 

 phur. Let the whole be boiled to dryness, and then strongly 

 heated, being stirred all the while till the materials are soften- 

 ed, care being taken to prevent ignition. Then, after having 

 added by degrees a proper quantity of water, let the whole 

 be filtered through a piece of linen. The result of this will 

 be a dark coloured fluid, which must be kept well corked in 

 a bottle. A single penful of this ink is sufficient to write one 

 or two quarto pages. It possesses, besides, all the qualities 

 which are required in an indestructible hik. It runs from the 

 pen much better than common ink, and does not load the pen 

 with foreign matter suspended in it. It resists also, with some 

 exceptions, the most powerful chemical agents. — This ink, 

 which seems to be a valuable present to the arts, is also an ex- 

 cellent marking ink for linen, and may be employed in dye- 

 ing dark brown colours. Abridged from the Ann de Chim. 

 February 1829, p. 220. 



4 Method of detecting the Adulteration of Flour with Fota- 

 toe Flour. By M. Henri. 3 



The method proposed by our author is to determine the 

 quantity of gluten in the flour to be examined. Good un- 

 adulterated flour contains about lOJ per cent, of gluten, as the 

 mean of J50 different kinds of the crops of 1827 and 1828; 

 whereas in the adulterated or mixed flour the gluten amount- 

 ed only to 6 or 6 1 per cent. — Journal de Pharmacie. 



5. Description of Mr Fowler'^s Patent Thermosiphon.-^ 



This instrument, which derives its name from %/ao?, hot, and 

 f/^w!', a tube, is intended generally for heating houses and 

 buildings, and for all horticultural purposes requiring heat. 

 The instrument in its simplest form is shown in Plate III. 

 Fig. 8, where A, B are two^open vessels. A is placed over a 

 fire-place, and B at any moderate distance from it, united by 

 the connecting tube D, (which may have a stop-cock E in any 

 part of it.) The vessels A, B are placed on a level with each 

 other, and partly filled, as here shown, with any fluid that 

 will not corrode the materials employed. In the present case, 

 I will suppose water to be the fluid used. C C is a tube, bent 



