NATURAL SCIENCES OP PHILADELPHIA. 115 



Old Formula. New Formula. 



Stephaiiite. 



5AgS + Sb,S3 Ag,^lS,"lSb^ 



Ag,^Sb-S," 

 Note Dana's first record of analysis by H. Rose gives atomic ratio of 

 Sb : S : Ag : : 1 : 4.3 : 5.2, but the indications are of a compound as above. 



Sartorite. 

 PbS +Sb,S3 Pb"=S./i=Sb,/" = S.," 



Pb"(Sb"iS/03 

 Brochantite. 

 From Forchhammer's Analysis (D 3). 

 (3CuO.S03),+ CuO.HO The ratio of 



Cu : : S : H : : .3 : 9 : 1 : 6 



hence 



Cu,"=0,"=S^^=0,"=Cu"+ 



+ aq 



hence Cu3"S^^O"+(H.p)3 



Change of Habit in Smilacina hifolia. Mr. Thomas Meehan 

 remarked that this plant, as was Avell known, was usually terres- 

 trial, preferring generall}^ the A'icinit}^ of large trees. It propagates 

 itself b}" underground stolons, advancing but a few inches each 

 season ; the stolons of the preceding year djing as soon as a new 

 one was made. He had recently seen a case where the stolons had 

 advanced from the ground, and up the trunk of a large chestnut 

 tree, to the height of about two feet ; the original stolons for sev- 

 eral years back having died awa}^, and the plant taken in a purel}^ 

 epiphytal character. The I-oots and stolons mostly had penetrated 

 the coarse, rough bark of the chestnut tree, the leaves only being 

 chiefly visible. The fact is trifling, and in old times, perhaps, 

 hardly worth recording ; but in these days, when the change of 

 character in connection with the evolution of form had such a 

 general interest, even this was worth recording. 



July 14. 



The President, Dr. R,uschenberger, in the chair. 



Seven members present. 



The following papers were presented for publication : 



"On Fertilization of certain Flowers through Insect Agency, 

 and other jNIatters Botanical." By Thos. G. Gentry. 



