IO4 H. H. NEWMAN. 



and the mouse. Of these all but the bat are domesticated forms; 

 so the armadillo is the second species of wild mammal whose 

 orogenesis has been investigated. 



Longley ('i i) points out very pertinently that the failure on the 

 part of investigators to secure material for the study of ovogenesis 

 in the higher mammals is due partly to the difficulty of procuring 

 the eggs of these forms in the conditions needed and partly to the 

 fact that the ovaries of large animals are too bulky for convenient 

 investigation, involving as they do a study of serial sections of a 

 comparatively enormous mass of tissue. 



III. MATERIAL AND METHOD. 



In the pursuit of the study of the maturation and fertilization 

 processes of wild mammals two courses are open to the investi- 

 gator. He may breed them in captivity, a precarious and not 

 often successful undertaking involving the killing of many 

 animals tamed at great pains. The only remaining course 

 of action is that which has been resorted to in the present investi- 

 gation, namely, to rely upon the chance collection of favorable 

 stages in the ovaries or fallopian tubes of freshly captured 

 females during the period of oestus. 



In the case of the armadillo of Texas very serious difficulties 

 are encountered in keeping the animals and breeding them in 

 captivity. In the first place they appear to breed but once a 

 year and would therefore have to be kept in considerable numbers 

 for a long time in order that an adequate collection of stages 

 could be made. Experience has shown that the animals are 

 extremely difficult to domesticate. They need much territory 

 for the exercise of their normal functions and apparently would 

 breed only if allowed to burrow in the ground as is their custom. 

 In addition to these obstacles to rearing, the animals, as they 

 have come under my observation, are almost invariably badly 

 infested with flesh parasites that rapidly gain the ascendency if 

 the animals are subjected to conditions somewhat less favorable 

 than the normal. 



In view of these conditions I have been forced to rely on serial 

 sections of ovaries and the attached fallopian tubes for my 

 studies of maturation and fertilization. The former process is, 



