APPATIATUS rOTl PAPEa-STAINING. 21 ' 



be proved, by ev^ry part of tlie tuurih cavity of the calf's sto- 

 mach having the property of coagulating milk. 



This property in the general secretion of the stomach leads Weaksto 

 to an opinion, that the coagulation of fluid substances is ne- ^st only^elid 

 cessary for their being act^.vl on by the solvent liquor ; and a fogd. 

 practical observation of the late Mr. Hunter, that weak sto- 

 machs can digest only solid food, is in confirmation of it. 



That in converting animal and vegetable substances into 

 chyle, the food is first intimately mixed with the general se- 

 cretion of the stomach, and after it has been acted on by them, 

 the solvent liquor is poured upon it, by which the nutritious 

 part is dissolved. This solution is afterward conveyed into 

 the pyloric portion, where it is mixed with the secretions pe- 

 culiar to that cavity, and converted into chyle. 



The great strength of the muscles of the pyloric portion 

 of some stomachs will, by their action, compress the con- 

 tents, and separate the chyle from the indigestible part of the 

 food , 



In animals whose food is easy of digestion, the stomach 

 consists of a cardiac and pyloric portion only ; but in those 

 whose food ts difficult of digestion, other parts are superadded, 

 in which it undergoes a preparation before it is submitted to 

 that process. 



III. 



DescHptiqn of a Mac/tine for Printing Paper Hangings. By 

 Mr. John jMiddletox, of St. Martins-Lane.'* 



JOY this machine the printer works with greater facility and Advantages ot 

 dispatch than in the usual way; and the tereboy, who could 

 with great difficulty serve one sieve, can by its means serve 

 two with ease to himself. For this in^provement the honorary 

 silver medal was voted to Mr. Middleton by the Society of 

 Arts. The following description shows the nature of this 

 apparatus for facilitating the operations in paper-staining, and 

 the mode of using it both for light and dark grounds. 



* From the Transactions of the Society of Ait?, for 1807, p. 135. 



Method 



