ROUND THE INDIAN MUSEUM. ,99 



alike in form, and, like a Protozoon, possesses the same 

 limited range of ill-developed functions, and let us now 

 suppose that to one group of cells is allotted the func- 

 tion of protecting the colony from external injuries, 

 and to another group of cells the function of digesting 

 the food of the colony. Then as a natural result of 

 special perfection in one set of protecting functions to 

 the relative neglect of the digestive functions, and 'vice 

 versa, these two groups of cells will gradually come to 

 differ in many points of structure and form. 



' In other words, among cells originally alike in form 

 the specialization of function to which the division of 

 physiological labour gives rise, leads to many differences 

 in form. 



i A second consequence of physiological division 

 of labour, and of the differences in occupation and struc- 

 ture to which it leads, is that all the various cells and 

 groups, like the citizens of a state, come to be mutually 

 dependent on one another.'* 



" Having heard so much about the many-celled 

 animals and of the "physiological division of labour" in 

 them, you must be naturally impatient to see some such 

 types in which this physiological division of labour can 

 be seen in its earlier and simpler stages. Well then, 

 here are our old friends the Zoophytes. Unlike the Pro- 

 tozoa in which the single unit of protoplasm performs 

 all the functions of life, the constituent cells of the body 



* Guide to the Invertebrate Gallery of the Indian Museum, by Surgeon- 

 Captain A. Alcock, Superintendent of the Indian Museum. 



