B Introduction to Animal Morphology. 



tissues, Calcium Carbonate either in a crystalline or 

 nodular form, usually the latter, in forms similar to 

 those assumed by it in deposits from viscid solutions 

 (see Harting, Verhandelingen der Koninklijke Akad., 

 Amsterdam, 1873, 13 Deel, p. 4), Nitrogen in the 

 swim-bladder of fishes, &c., Hydrochloric acid in 

 the gastric juice, Sulphuric acid in the saliva of 

 Dolium galea, &c. 



dilute acids, gelatinizing on cooling, precipitable by alcohol, corrosive 

 sublimate, &c. 



Chondrin, formed by boiling chondrogen, which forms the hyaline 

 basis of cartilage, CieHaeNoO? precipitable by acetate of lead, alum, but not 

 by mercuric chloride. 



Ossein from the intercellular substance of bone resembles Gelatin in 

 most of its properties, but is more soluble. 



Elastin from yellow elastic tissue is insoluble in water, alkalies, and 

 most reagents, except strong solution of Pot 



Spongiolin, allied to Keratin, is the element making the horny skeleton 

 of sponges. 



Conchioliti, allied to Gelatin, is the animal clement in the shells of 

 Mollusca. 



Acanthin, like Spongiolin, is the substance which composes the spicules 

 in some Radiolaria. 



Neossin, like Gelatin, is the element of which the Edible Birds' nests 

 are made. 



Chitin, the indurating material of the integument of Arthropods, 

 CiiHjsNjOn insoluble in all ordinary reagents, except in strong mineral 

 acids. 



The non-nitrogenous elements are fats, which consist of the following : 



( 



Stearin C 3 H'" 5 ! 

 ( 



(HaaO 

 O.CuHnO 

 O.C, 8 H 33 O 

 ( O.C 16 H 31 



Palmitin C 3 H'" 6 J O.Ci 6 H 31 O 

 ( O.C 16 HaiO 

 OH 



