NATURAL SCIENCES OF PHILADELPHIA. 119 



order was that of opposite leaves, onl}' that on one side of the 

 node, instead of the opposite leaf and axillary bud, the whole had 

 been developed into a tendril, thus giving the api)earanee of an 

 alternate-leaved structure. This appeared the more probable as 

 the Phyllotaxis was in the half arrangement so common in oppo- 

 site-leaved plants. But the appearance of the tendril, as in this 

 case, could scarcely be deemed possible under this view, and it 

 might be that the tendril really belonged to the leaf S3'stem oppo- 

 site, as we saw it in Gucurbitaceee, Pasi^ijloracese, &c., only that 

 it had become twisted around on the opposite side. We saw this 

 tendency in Cucurbitaceae. Instead of being exactly over the leaf 

 axil as in Passifloracese, it was twisted so as to extend one-third the 

 way round the axis in Cucurbitacefe, and it might, therefore, get 

 half-way round in the grape-vine and other vitaceous plants. But 

 he simply made this as a suggestion. He thought that at any 

 rate the appearances of the tendril in this instance might be of 

 service to those who were stud^'ing the morphology of tendrils iu 

 this tribe of plants. 



The death of Mr. Stephen Morris was announced. 



May 30. 



The President, Dr. Ruschenberger, in the chair. 

 Twenty-two members present. 



The report of the Biological and Microscopical Section for Jan- 

 uar}', February, March, and April was received. 



The following gentlemen were elected members : "Wm. Camp- 

 bell Gatzmer, and Samuel P. Wetherill. 



On favorable report of the committees, the following papers 

 were ordered to be published : — 



isn.i 



