HOW THE ANIMAL LIVi:s 



233 



3C5a. Lymph is n product of the blood. It is n pale liquid 

 wliioli trniisudcn from the thin or oapillury Mood vessids, and is 

 ustd to nourish niul l>uild up Iho tissues. The lymphiitic system 

 carriis food materials to the plnoes where they are needed. 

 Sie -lOD/i. 



3G7u. By the alimentary canal is lueant tlie whole ilifjestive 

 traet, bt-jjinning with the mouth, and comitrisinj; the gullet or 

 csophapus, the stomaeh, the small and larj;e intestines. 



371rt. The fats contain carbon, 

 hydrogen and oxygen, but the o.\y- 

 gen is ill small proportion. One 

 of the common fats (palmatini has 

 the composition CV.iHggOo ; another 

 (stearin) is CjtHhuOo. 



379(1. In physiology, the word 

 firmiiit is used to designate sub- 

 iiices which have power to make 

 ich-like materials soluble bycon- 

 " rting them into sugar- like materi- 

 als. These ferments, of which pfyalin 

 is one, are secretions. They are also 

 called cnzyms. These secretions 

 may be tiie products of cells in the 

 nnimal body or of independent micro- 

 organisms. The luioro-organisniB are themselves often called 

 f«'rmenl» [^rta). 



'dS2a. The single stomach of ii carnivorous animal is shown 

 III Fig. 80. The stomach of n ruminant is well illustrated in 

 Fig. 87, the front walls being cut away to sliow the internal 

 structure. It has four divisions : C, paunch ; U, reticulum ; N, 

 manifoMs ; O, the true digesting stomach. 



3H,Vt. There are various expcriim-nts which the pupil can 

 |>rrf<>rMj. • Mix a little well-l»oiled starch with n small quantity 

 of saliva, and nft«'r n time it will be found to have become 

 sweet. If at Iho outset n drop of solution of iodine is added 

 to the mixture it will pro<luce a blue color (203/>). As the 

 starch is changed into sugar, this color gradually fades and in 

 the end disappean. 



it);, sb. ;>u 



