PHILOSOPHICAL SOCIETY OP WASHINGTON 97 



remarks thereon, and dwelt particularly on the homologies of the 

 limbs of the lower vertebrates. 



Mr. L. D. Gale made a communication 



ON THE CAUSE AND REMEDY OF THE POTATO ROT. 



The author maintained the so-called " chemical theory" of the 

 oi'igin of this disease, and adduced in corroboration experiments 

 made during the past ten years in Long Island and New Jersey. 



Remarks followed by various persons present, especially by 

 Prof. Brewer, of Yale College; the latter gave a brief synopsis 

 of the many theories that have been broached m reference to this 

 phenomenon, and showeti the unsatisfactory nature of conclusions 

 deduced from any partial investigation. 



65th Meeting. March 14, 18U. 



The President in the Chair. 



Mr. L. D. Gale offered some remarks in explanation of his 

 communication at the previous meeting in reference to the potato 

 disease. 



Mr. C. S. Peirce made a communication 



ON VARIOUS hypotheses IN REFERENCE TO SPACE. 



Mr. J. M. Toner illustrated, by means of a map, 



A METHOD OF DESCRIBING AND LOCATING WITH EASE THE APPROXI- 

 MATE POSITIONS OF GEOGRAPHICAL REGIONS. 



Mr. Joseph Henry made a communication 



ON A METHOD OF DEVELOPING MAGNETISM IN BARS OF STEEL. 



66th Meeting. March 28, 1874. 



The President in the Chair. 

 Mr. C. E. Button made a communication 



ON recent improvements IN THE MANUFACTURE OF STEEL. 



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