INTE LLIGENCE, 



developed in excess of the brain-adrenal pattern of a depend- 

 able horse. In Equipoise we see a well-balanced energy 

 system. These mutations seen in the horse family are similar 

 to mutations seen in the human family. 



The Arab Compared with Three Generations 

 of the Thoroughbred 



Through the kindness of Mr. Roger A. Selby, of Ports- 

 mouth, Ohio, we had the privilege of studying his famous 

 Arabian breeding stallion Nureddin, bred at Crabbet stud, 

 England (sire, Rijm by Ibu Mahruss, out of the famous 

 mare Rose of Sharon, dam, Narghileh, by Champion 

 Mesaoud) as well as his famous white Arabian stallion 

 Mirage (sire, A. Kehilan Ajuz, of the Anazeh; dam, A. 

 Seglaw ieh Jedran, of Dalia). 



Through the interest of Major Beard, of the Whitney 

 stables, and Dr. Dimock, of the University of Kentucky, 

 we were given the opportunity in Lexington to study 

 Pennant, the famous twenty-seven-year-old thoroughbred 

 stallion, and an eight-months-old colt. The sire of Pennant 

 was Peter Pan out of imported Andirella; the dam, Royal 

 Rose by Royal Hampton. 



Through the cooperation of Major Beard of the Whitney 

 stables, Dr. Fred Rankin, of Lexington, Kentucky, Dr. 

 Dimock, and Dr. Errington, the brain-thyroid-sympathetic 

 system and heart of the famous race horse Equipoise, 

 sired by Pennant, out of Swinging, were sent to the Cleveland 

 Clinic Laboratories for study on the night that he died. 

 This gave us the unique opportunity of comparing three 

 generations of thoroughbreds Pennant, Equipoise, and 

 the young colt sired by Equipoise out of imported Air 

 Fleet grandfather, father, and son, with Nureddin, the 

 tallest known pure-bred Arabian stallion. 



A comparison of the size of the brain, the heart, and 

 the thyroid and adrenal glands of these three thoroughbreds 

 with those of Nureddin, the Arabian, follows. 



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