clii 



vated varieties were supposed to ha^ e originated in Chili and 

 Peru. Dr. Engelmann stated that the tuber referred to by Mr. 

 H*arrison was a small one, belonging to a species of Solanum 

 diflerent from the Solanum tuberosum^ which gave rise to the 

 cultivated varieties, and was never larger than a marble. Mr. 

 Riley stated, that, on account of the degeneracy noticed of late 

 years in most of our cultivated varieties of potato, some agricul- 

 tural journals had suggested the propriety of experimenting anew 

 with the wild tuber, with a view of producing more vigorous 

 varieties. 



Judge Holmes referred to some experiments cited by Dr. Car- 

 penter with Faradic electricity on different pai-ts of the brain, the 

 notable results of which went to show that the increase of intel- 

 lect was in proportion to increase of the middle and posterior 

 parts of the cerebrum, and not of the front parts, as was 

 generally supposed. 



December 7, 1874. 



Dr. J. B. Johnson, in the absence of the President, was called 

 to the chair. 



Thirty-six members present. 



The Corresponding Secretary submitted communications and 

 exchanges. 



Mr. G. C. Broadhead donated a copy of his Geological Survey 

 of Missouri, and a vote of thanks was tendered him for the 

 same. 



Dr. Engelmann presented three maps of Colorado, sent to him 

 by Prof. F. V. Hayden as illustrating the work of the Govern- 

 ment Geological Survey in that Territory the past year. One 

 curious thing noticeable was the fact that many of the higher 

 peaks are so nearly of the same height, being within a few feet of 

 each other. Gray's Peak is the highest, but only one foot higher 

 than Mt. Rosalie, and five feet higher than Torrey's Peak. He 

 also presented some meteorological observations condensed from 

 the Records of the U. S. Signal Service at Canon City, in South- 

 ern Colorado, and made the following comparisons of means and 



