1898.] MICROSCOPICAL JOURNAL. 39 



This diatom has been supposed to lack a finely perfor- 

 ated membrane except on the conical side and convex 

 top of the rose of the watering pot. The new Powell 

 condenser, however, reveals it. It can only be seen by 

 means of a direct axial cone of, maximum dry aperture. 



In AuHscus sculptus, !N"elson has at last succeeded in 

 resolving the rose pattern in the processes of this diatom. 

 It was found in A, racemosus in 1891 which led to the 

 supposition that it existed in sculptus. It is exceeding- 

 ly fine but it is there. Sculptus also has very fine per- 

 forations in its beautifully fine sculptured border. All 

 the above diatoms were mounted in balsam. Some dis- 

 coveries have also been made in Actinocyclus ralfsii and 

 in Eupodiscus argus by Mr. Nelson who recently reported 

 them before the Quekett Club, 



PRACTICAL SUGGESTIONS. 



BY Iv. A. WILLSON. 

 cr<E;vE;i,AND, ohio. 



Mounting Uncinulas, — The quickest and best way to 

 mount these beautiful fungi is to preserve them unstained 

 ed in glycerine jelly. They show best when t*^mporarily 

 examined in a drop of water but jelly is the next best 

 thing. Few prettier specimens can be found for a cabi- 

 net. Though generally unknown and unseen it is almost 

 impossible to pass through the woods without trampling 

 them under foot. They are found on the leaves of Tillia 

 americana, grape leaves, Virginia creepers, bunches of 

 grapes, on maple, elm, and other leaves. 



Exhibits. — When invited to exhibit slides to a mixed 

 company, the majority of whom are not scientists, do 

 not take technical specimens but take the prettiest slides 



