(7) 



PROPAGATION AND DEVELOPMENT. 



The adequate treatment of propagation and develop- 

 ment in each of the various genera is beyond the scope 

 of a systematic work such as the present, even if it 

 were possible in the present state of our knowledge 

 of the subject, but in only a very few species has 

 the embryology been worked out, and perhaps not 

 exhaustively even in some of these. In the Amoebina 

 especially are details of life-history lacking, and it is to 

 be hoped that competent observers willing and able to 

 devote the necessary time will be found to carry out 

 further investigations. 



English readers will find most of the information 

 which is available on the biology of the Sarcodina in 

 the works of Calkins, Ray Lankester, and Minchin, 

 especially in the latter's ' Introduction to the study of 

 the Protozoa,' 1912 ; also in the Cambridge Natural 

 History. 



