GROWTH AND MOVEMENT. 71 



The puppy of a setter-dog at its birth is a very 

 different animal from what it is at an adult age. 

 The difference between the two stages of growth 

 would at once strike any ordinary observer, and, if 

 he analyze and arrange the points of difference, he 

 will find differences in size, form, proportions of the 

 body ; also differences as marked in the behaviour, 

 running, steadiness, and kind of work done, i.e. dif- 

 ferences in the kind of movements done and the 

 results of movement. Thus analyzing the points of 

 difference between the puppy and the full-grown 

 dog, it will be seen that it is as important to 

 describe the movements as an expression of the 

 difference between youth and maturity, as to 

 describe the changes in the body alone. Further, 

 there are other changes in function in the animal 

 as the puppy grows to be an old dog ; the conditions 

 of its movements change, and its body, its corpus, 

 changes independently of its movements. There is 

 seen, then, an alteration in two kinds of functions, 

 or properties, as the animal, grows old : first, a 

 change in the functions of movement ; second, 

 a change in its trophic condition. A complete 

 historical account of the growth or change of a 

 puppy into an adult animal requires the description 

 of the changes in the conditions of its movements 

 and the differences in its trophic conditions, or 

 growth. 



It is very usual to speak of the important 

 differences between co-ordinated movements, and 

 inco-ordinated movements. In this chapter we 

 have nothing to do with the causes of co-ordination 



