10 



G. V. HAMILTON 



TABLE I — Continued 



Subject Age 



Girl 18 9 years. 



Girl 19 9 " . 



Girl 20 12 " . 



Baboon 2.^ Adult. 



Monkey o 



Monkev 16 



Monkev 18 



Monkey 26 



Mouse 1 



Gray Rat 1 . 

 Gray Rat 2. 

 Gray Rat 3. 

 Gray Rat 4 . 

 Grav Rat 5. 



Black Rat I . 

 Black Rat 2. 

 Black Rat 3. 

 Black Rat 5. 



White Rat 

 White Rat 

 W'hite Rat 

 White Rat 

 White Rat 

 White Rat 

 White Rat 8 

 White Rat 10 



Gopher 1 . 

 Gopher 2. 

 Gopher 3 . 

 Gopher 4 . 

 Gopher 5 . 

 Gopher 6 . 



Race or Species 

 , Mexican 

 . Italian 

 .Mexican — feeble minded 



. Species unknown 

 . Pithecus rhesus 



.Mus musculus 



. Mus rattus alexandrinus 



. Mus rattus 



. Mus norvegicus albinus — ^strain A 



litter 3-4 

 strain B 



. Geomvs bursarius 



All but four of the subjects given in table 1 had at least 100 

 formal trials each: I was unable to complete the series with 

 Gopher 6 and with Giris 2, 6 and 19. Baboon 2 had 500 trials 

 and Monkey 26 had 200 trials. 



The giris are inmates of an orphanage, a circumstance on 

 which largely depends the dissimilarity of their records to those 

 of the human subjects of my earlier studies (1). It is significant 

 that three of the orphans are distinctly feeble minded. Although 

 some children of good stock are found in our local orphanage, 

 many of them are descended from parents who are mentally 

 inferior, socially delinquent or shiftless and incompetent. The 

 most inferior strains of the native Mexican population are also 

 represented in our institution. 



