136 THE AMERICAN MONTHLY [June, 



the latter is found display great similarity to the large leprosy cells of 

 Virchow, in which Bacillus leprce occurs. One point of difference is, 

 the motility of the bacillus leprae and the non-motility of the tubercle 

 bacillus. Another point of difference is, that tuberculosis may be pro- 

 duced in animals by inoculation ; while the bacillus of leprosy is only 

 with difficulty inoculable in the lower animals, and in man probably 

 requires a certain predisposing condition, just as a phthisical tendency 

 is usually necessary for the development of consumption. The bacillus 

 of leprosy is stained much more readily than that of tuberculosis. 



The material was procured in Vienna from which the bacillus lepra; 

 was obtained. 



A New Wax Cell. 



Dr. S. E. Stiles, of Brooklyn, N. Y., has invented a new wax cell and 

 demonstrated before the Microscopical Section of the Brooklyn Institute 

 the method of constructing the cell and mounting of objects therein. 

 The cell is both simple and effective. Sheet wax, such as is used by the 

 makers of artificial flowers, is the material employed. Three or four 

 sheets of different colors are pressed together by the thumb and finger 

 to cause them to adhere, and a square of the combined sheet thus formed 

 of sufficient size for a cell is cut out and pressed upon a glass slide. The 

 slide is then placed upon a turn-table, when, by the use of an ordinary 

 penknife, the wax is cut into a circular form, and the centre is cut out 

 to the required depth. If the cell is to contain a transparent or translu- 

 cent object, the entire central portion of the wax is removed ; but if a 

 ground is required for the object, one or more layers of wax are allowed 

 to remain. A portion of the upper layer of wax is removed to form a 

 rim for the reception of the cover glass. Where a black ground is re- 

 quired, a small disk of black paper is pressed upon the lower layer of 

 wax. The final finish is given to the cell by a coating of shellac varnish, 

 applied while the slide is on the turn-table. These cells are very quickly 

 made and have the finished appearance of cells formed of different col- 

 ored cements. 



Bud Sectioning— The Shell-bark Hickory. 



By Dr. HENRY SHIMER, 



MT. CAKROLL, ILL. 



Continuing the remarks published on page 104, it may be stated that 

 the cross section, though not so beautiful, is as important as the longi- 

 tudinal section. 



This bud is prepared by soaking it several days in water. The one 

 we now section has been in cold water over two months, in a cold 

 room, changing it twice a week. Now cut a section above the centre 

 toward the apex ; the razor is well flooded with water and held horizon- 

 tal. As the cut is being made the water flows into the segments of the 

 bud leaves and holds them in situ. We now float the section off care- 

 fully on the slide, and mount as before. Then cut away a portion of 

 the bud and make another section near its middle, and so on down, 

 making several sections at intervals until the base is reached. These 

 several mounts give us a good understanding of the plan and arrange- 

 ment of the bud leaves. In the long section the hairs are in place, but 

 in the cross sections they are cut oft' and lying around like mown grass. 



