S4 INTRODUCTION. 



we may also add to it, those which are produced and deposit- 

 ed, as if in reserve (by a secretion that we may call intrinsic.) 

 in the closed cavities of the body, such as fat, serosity, syno- 

 via; but we principally attach to it those which are secreted 

 on the surface of the teguments, external or internal, and of 

 their appendages more or less removed. From their mode of 

 formation, we divide them into three classes or kinds: 1st, in 

 perspiratory humours, which are immediately formed and de- 

 posited on the surface by the vessels: such is the matter of cu- 

 taneous transpiration, of sweat, of the pulmonary perspiration; 

 2d, in the follicular humours, which at first are deposited in 

 the follicles of the skin, internal or external: such are the mu- 

 cus, and the sebaceous matter; and 3d, in glandular humours, 

 formed in the glands, peculiar organs, which have excreting 

 ramifying ducts opening on the skin and mucous membranes, 

 of which they are prolonged ramifications: such are, the saliva, 

 secreted by the salivary glands, the bile secreted by the liver 

 &c. We also divide the secreted humours, from their desti- 

 nation into those which take part in the organism, as the tears, 

 bile, sperm, etc., and into those, which being rejected without 

 answering any purpose whatever, are called, excrementitious. 

 These last are acid, whereas the others are alkaline. 



OF THE ORGANS. 



82. The organs are the solid* or the containing parts of 

 the body; they it is which above all, determine the form of 

 the body, and which direct its motions. 



The figure of the organs is greatly varied : generally speak- 

 ing, however, their contour is rounded; the surfaces are never 

 perfect planes, the lines very straight, or the angles very en- 

 tire. In the generality of them, the length is greater than 

 that of the two other dimensions; some are large and flattened: 

 those that have this form and are soft, are called membranes, 

 whatever, in other respects, may be their texture; others again 

 have but little difference in their three dimensions. We de- 

 termine the external form of the organs by the relation of 



* See Chaussicr. Tublc dcs solides organiques. 



