NATURAL SCIENCES OF PHILADELPHIA. 3 



large globular heterocysts raised on short branches. No distinct sheaths were 

 visible ; everywhere between the filaments was a uniform jelly. 

 The following are the generic and specific characters : 

 Genus Nostochopsis. Thallus definitus, trichomata ramosa; cellulis perdur- 

 antibus in latere sessilibus ant in ramulis brevissimis superpositis. 



C. LOBATA. — C. thallo viride aut luteo-viride, cavo, enormiter lobato, 

 natante, modice magno, (ad 05 unc in diametro) ; trichomatibus plenimque 

 longis, flexuo«is, viride, modo inarticulatis, partim articulatis, cylindricis aut 

 submoniliformibus, sparse granulatis. 



February 15th. 

 Director S. W. Mitchell, M. D., in the Chair. 

 Twenty-two members present. 



March Ist. 

 Director S. W. Mitchell, M. D., in the Chair. 

 Twenty-six members present. 



Dr. R. J. Levis exhibited two pathological specimens illustrating embolism, — 

 one, an embolus, three inches long, from the external iliac artery; the geconrl, a 

 gangrenous hand, in which the condition was induced by embolism of the 

 brachial artery. 



March 15th. 

 Director S. W. Mitchell, M. D., in the Chair. 

 Twenty-two members present. 



April 5th. 

 Dr. Ruschenberger in the Chair. 

 Twenty-two members present. 



Dr. J. G. Hunt remarked, that in a specimen of Cissus in his possession, he 

 had recently noticed in the leaves such an exuberant growth that the paren- 

 chyma actually burst througli the cuticle. That he had also noted, growing 

 in its vicinity, a specimen of the Cuscuta, which soon embraced the Cissus, and 

 by its parasitic rootlets planted itself upon the latter plant, in which ihe ex- 

 huberant growth was taking place, after which this excess of growth was 

 gradually checked. The Cuscuta is a parasite which never attaches to cryp- 

 togams; a fact probably indicating some undetected difference in the sap of 

 the flowering and the flowerless plant. 



Ajyril Idth. 

 Director S. W. Mitchell, M. D., in the Chair. 

 Twenty-three members present. 

 Dr. J. G. Hunt presented the following : 



Improved Microscopical Cement. — Dissolve old and hard Canada balsam in 

 chloroform until it is quite fluid ; then add enough oxide of zinc ground in 



