Proceedings. 13 



competition with the more lobust cross-fertilized sporophyte. It is appar- 

 ent then that polyembryony is the rule among the Metaspermae and that 

 every seed, at some time in its life (with the possible exception of some 

 orchids), bears within its coats two plants, only one of which has the 

 strength to develop into an embryo and ultimately into a seedling and 

 mature sporophytic structure. 



It is maintained then, that the Metaspermge are peculiarly characterized 

 by persistent specific dimorphism of a high grade and this alone serves to 

 limit them from all other living things. Each specific form consists of four 

 potential individuals, where the dimorphism is at its^height. These are (a) 

 the male plant or pollen-tube, {b) the female plant or embryo-sac contents 

 (and in the Metaspermae the female is binovular), (c) the staminate, sporo- 

 phytic plant of vegetative specialization, and (c/) the pistillate, sporophytic 

 plant— also of vegetative specialization. 



S. P. Channell presented a beautiful piece of Sphalerite 

 from Joplin, Mo., for which the secretary was directed to ex- 

 tend the thanks of the Academy. 



The meeting adjourned until the second Tuesday in June 

 instead of the first, as regularly', owing to the Republican 

 National Convention, 



June 14) 1892. 



At this meeting there was no quorum, but Mr. Uly S. 

 Grant presented a paper on "The stratigraphical position of 

 the Ogishke Muncie conglomerate of northeastern Minne- 

 sota,"^ of which the following is an 



[abstract.] 

 A brief review of the first description of this great conglomerate is given, 

 folio w^ed by a summary of the opinions of the geologists w^ho have w^orked 

 in this region, in regard to the relation of this formation to the surround- 

 ing rocks. The relation of the conglomerate to the rocks in its immediate 

 vicinity, and especially to the Saganaga granite, was discussed and the fol- 

 lowing conclusions arrived at: The Ogishke Muncie conglomerate can no 

 longer be correlated with the Animikie, as has often been done, for the two 

 are separated by a great structural break and an immense erosion interval. 

 The conglomerate grades, both along and across the strike, into rocks 

 which have as yet not been separated from the Keewatin series. At present 

 it seems best to regard the conglomerate as an upper member of the Kee- 

 watin. 



October 4, 1892. 



Twelve persons present. 



The following program was heard: 



*This paper is published in the American Geologist for July, 1892, pp. 4-10. 



