24 BOVINE OBSTETIUCS 



Colin, Goubeaux and Lanzilotti-Buonsanti, accept Franck's 

 proposition. 



We characterize the various periods of the bovine foetus 

 as follows : 



First month : The embryonic period, lasting 28 days. 

 The foetus is 9 to 10 mm. long ; the first signs of extremities 

 appear. 



Second month : This period extends f torn the 30th to the 

 60th day. The extremities develop. The pharyngeal cleft closes 

 in the beginning of this month. The sternum still has a longi- 

 tudinal fissure in the middle, closing toward the end of the 

 eighth week. At the end of the second month one notices 

 at the end of each extremity a little conical elevation, which is 

 colorless and transparent. This is the first indication of the 

 hoof. The length of the foetus is 48 mm. (Gurlt). In the 

 ninth week its length is 8 cm. (Lanzilotti-Buonsanti). 



Third month (60th to 90th day) : Toward the end of this 

 month the four stomachs may be recognized (Gurlt). The 

 foetus measures 14_cm. L in length. The scrotum is present. 



Fourth month (90th to 120th day): In the beginning of 

 the fourth month the hoofs become quite distinct; they are 

 firm, non-transparent, and have a yellow color (Colin). The 

 foetus is about 24 cm. long and weighs up to 2 kg. (Frauck). 



Fifth month (120th to 150th day) : In the beginning of the 

 month the first tentaculse (tactile hairs) appear on the lips, 

 chin, upper eyelid, and orbital arch. The teats are plainly 

 visible. The testicles descend into the scrotum. The foetus 

 is about 35 cm. long and weighs 2} 2 to 3 kg. 



Sixth month (150th to 180th day) : The eyelashes are 

 more developed. The foetus is about 46 cm. long. The whole 

 body is still naked excepting the lips and eyelids. 



Seventh month (180th to 210th day): At the end of 

 this month a few long hairs appear at the end of the tail; 

 also hairs about the coronet and on the spots where the horns 

 appear. The foetus is about 60 cm. long. 



Eighth month (210th to 240th day): The back begins 

 to be covered with hair, also along the edges of tho ears. The 



