— 3 o — 



The professor's private laboratory on the northwest corner is 

 iox 15 feet, and contains his private botanical library and working 

 tables. 



The general laboratory for cryptogamic and histological work, 

 adjoining it, is 22x22 feet, with a small eastern extension, con- 

 taining a glass-ware case, and sink. The university instruction 

 in Cryptogamic Botany and Histology is also carried on in these 

 rooms throughout the college 3*ear, although a part of the stu- 

 dents are obliged to have their work-tables in the adjoining mu- 

 seum. The advantages of the association, thus brought about, 

 of the less-trained students with the more advanced, and with the 

 processes of more advanced work are not to be ignored, but hardly 

 equal the disadvantages of the excessive crowding of work, and 

 the appliances for working. 



In Figure 3, a portion of the north side of this laboratory is 

 shown, including the two work-tables used during 1S89-1890, by 

 those who were carrying out the observations and experiments on 

 the Clover Rust, and the Quince Blight. The farthest table is oc- 

 cupied this year by the present Fellow in Botany, and many of 

 the appliances on this table, the section-cutter on the table behind 

 it, and some of the apparatus on the large table seen on the right, 

 are for the more refined methods of preparing, sectioning, and 

 permanently preserving parts of plant-structure, the subjects of 

 stud\- in the laboratory. In investigating the mode of attack of 

 fungus-mycelium on the tissues of the host-plant, we have found 

 these methods of sectioning important. 



The case in front contains the chemicals for immediate use in 

 our work, and supports the jars for alchohol and distilled water. 

 The large table seen on the right, occupies the entire middle of 

 the room, and is utilized for artificial cultures, for temporary re- 

 ception of apparatus and laboratory appliances, its drawers serv- 

 ing for the storage of various working materials. In this room is 

 also the case for glass-ware, a platform for the sterilizing appara- 

 tus, necessary in preparing all cultures of fungi, and one of the 

 cases for the fungi collections. The room is lighted by narrow 

 windows, especially designed, we have been told, for laboratory 

 illumination. 



The collections available for use comprise the Ellis collection of 

 North American Fungi, Ravenel's Fungi Americani, Mougeot and 



