298 THE UNIVERSITY SCIENCE BULLETIN. 



IVs. Mule (female). 

 IV9. Mule (female). 

 IVio. Horse (male) ; bay with no spotting. (See figs. 1, 2 and 3.) Twin 



to mule IVii- Normal. Lived into the second year, probably 



eighteen months. "Died of natural causes; poor feed and ex- 

 posure in second winter (1914-'15." 

 IVii. Mule (female) . Twin to horse IVio Solid light bay; slight blaze to 



right of center of face. Normal strong mule. (See figs. 1, 2 



and 4.) 

 IV12. Mule (male) ; bay or brown. Twin to IV13. No blaze on forehead; 



slightly lighter in color, and with lighter muzzle and under parts 



than its twin mate. (See figs. 5 and 6.) 

 IV13. Mule (female) ; bay or brown. Twin to IV12. Blaze on forehead; 



general color slightly darker, and muzzle and underparts slightly 



darker than twin mate. (See figs. 5 and 6.) 

 IV14, IV15. Pair of horse twins. Sex unrecorded; foaled too soon 



("slipped") by half sister to III9, at between eight and nine 



months of gestation. 

 Vi. Horse (male). Twin to V2. Sorrel with bald face and white points 



like grand dam III9. Did not live to maturity, 

 V2. Horse (male). Twin to Vi. Solid bay. Did not live to maturity. 



PLATES II, III AND IV. 



Fig. 1. Photograph of mare III9 and her horse-and-mule twins (IVio 

 and IVii) at three days after birth, taken by a local photographer. Per- 

 sons photographed are sons of the owner. 



Fig. 2. Photograph of mare III9 and her horse-and-mule twins, taken 

 by the local school teacher in winter of 1914-'15. 



Fig. 3. Photograph of mare III9 and the horse colt twin, taken at 

 same time by same party at closer range. 



Fig. 4. The mule twin IVn, in harness at thirty months of age. The 

 horse IVi is the first colt of the mare III9. Photo by the author, 

 March, 1916. 



Fig. 5. Third pair of twins (mules), IV12 and IV13, at five days of 

 -age. Taken summer of 1915. 



Fig. 6. Same as fig. 5, but lateral view. Photo by author, March, 1916. 



