1887.] ^'J [Genth. 



servation of those familiar with mental disease the responsibility of the 

 individual for acts cannot be doubted. When, therefore, it becomes a 

 question of the responsibility of a person for his acts, a theory is too often 

 misleading. 



Judge Ludlow, in his opinion in Taylor's case, has drawn the dis- 

 tinction with the force of scientific truth when he says. Scientific meta- 

 physics, as applied to mind disease, may suggest medical insanity. 

 Whatever medical insanity may be, it is now clearly determined to be the 

 law in Pennsylvania that insanity to be a defence in murder must be de* 

 termined by legal principles. Responsibility for crime is now to be de- 

 termined by legal tests. Medical insanity resting on scientific metaphysics 

 may be accepted as authority by medical experts, but before the law, legal 

 insanity can only be recognized. 



This enlightened and learned Judge, worn out by judicial labor, ended 

 his days on the 20th day of September, 1886, in the 62d year of his age, 

 with a high reputation, gained and earned in the thirty years of devotion 

 to tlie conscientious discharge of his high trust. 



It is due to the character of James R. Ludlow, that the American 

 Philosophical Society should eni'oll his name among those of its members 

 who worthily obtained and richly merited by his life-work the honorable 

 distinction of its membership. 



Contributions from the Chemical Laboratory of the 

 University of Pennsylvania. 



No. XXIX. 



CONTEIBUTIONS TO MmERALOGY. 



By F. a. Genth. 



(With one phototype plate and three wood-cuts.) 

 ' Read before the American Philosophical Society, March ISth, 1SS7.) 



I. On the occurrence op Tin Ores in Mexico. 



The ores which are the subject of the following investigation were re- 

 ceived in January, 1885, from Mr. John L. Kleinschmidt of San Miguel 

 del Mesquital in the State of Zacatecas, Mexico,* to whom I am greatly in- 

 debted for this gift, and for highly interesting observations, regarding 



* r have just learned from Mr. Kleinschmidt that he has returned toHillsboro', 

 Jefferson Co., Mo. 



