564 EMBRYOLOGir. 



hair appears on the crest aud back. The testicles lie near the 

 abdominal ring. 



(6.) Ox. — The embryo at the end of 32 weeks measures about 

 25 inches. 



(c.) Sheep and Gnat — The embryo has a length of from 10 

 to 13 inches. 



(d.) Pig. — The embryo measures about 7 inches in length. 



(tf.) Carnivora. — The dog's embryo measures about 5 inches; 

 the cat's embryo, 4 inches. The body is covered with hair, and 

 the claws are present. The eyelids are closed, and the testicles 

 are still in the abdomen. 



VII. PeHod. — Includes, in the horse, the 35th to the 48th 

 week ; in cattle, the 33rd to the 40th week; in the sheep and 

 goat, the 19th to the 21st or 22nd week ; in the pig, the last 

 half of the 15th to the 16th or l7th week; in dogs, the 9th 

 week ; and in cats, the 8th week. In all animals it reaches up 

 to the time of birth. 



(a.) Horse. — The foetus attaios at the end Of this period a 

 length of over a metre (3 feet) ; it is completely covered with 

 hair, and the testicles pass into the scrotum. The inguinal ring 

 is very wide, and slight hernia is generally present. 



(b.) Ox. — The foetus measures about 32 inches. 



(c.) Sheep. — The foetus has a length of about 18 inches. 

 Ooat. — The foettis measures about 13 inches; if only one foetus 

 is present, 18 inches. 



(d.) Fig. — The fostus has a length of 10 inches. 



(e.) Carnivora. — The foetus measures about 7 inches. The 

 cat's foetu^ about 5 inches. 



