2070 Journal of Applied Microscopy 



the sheets with the ordinary photographic paste. This permits the packets to 

 be removed without tearing the paper. The different genera of the Uredineae 

 are kept on separate sheets, and only those on one species of host kept on a 

 sheet. I am arranging the hosts according to Torre and Harms' Genera 

 Siphonogamarum, as that work appears, and each sheet is numbered at the top 

 with the genus number used therein. This facihtates the keeping of the speci- 

 mens in order. Alphabetical indexes of the genera of the larger orders are 

 pasted on the doors of the herbarium cases. The packets are placed far enough 

 apart to permit of adding illustrations, references to literature, etc. The packets 

 are the ordinary ones furnished by the Cambridge Botanical Supply Co., not the 

 specially cut form. A most important aid in the study of the Uredinece is a col- 

 lection of mounted slides. I use a method devised by Prof. J. C. Arthur, which 

 is to mount the spores dry, fastening the cover-glass with a narrow strip of 

 gummed paper. I number the slides, and on the packet from which the mount 

 was made is marked " Slide No. — ."' 



These slides save a large amount of valuable herbarium material, are always 

 ready to examine dry to show the surface markings of the spores, and by adding 

 a drop of distilled water, the spores soon swell to their full size. 



In this arrangement of a herbarium no time is lost in looking up names of 

 fungi to see what the collection contains (which might require looking up 

 various synonyms), and unnamed specimens can be placed in the collection and 

 they will be in the proper place when the fungi on that genus or order are being 

 studied. Changes in the name of the fungus do not affect the position of the 

 specimen in the herbarium. E. W. D. Holwav. 



Decorali, Iowa. 



New Pathological and Bacteriological Laboratories of the 

 Medico-Chirurgical College, Philadelphia. 



In planning the new laboratories for the Medico-Chirurgical College, a suc- 

 cessful attempt has been made to conduct all of the work of a department upon 

 a single floor of a large and well lighted building, securing for those departments 

 where the microscope is to be used the upper and best lighted stories. The 

 pathological and bacteriological laboratories were, therefore, placed upon the 

 fourth floor of a tall building with an unobstructed view from the windows of 

 every side. 



The Department of Pathology and Bacteriology is divided into two main 

 laboratories, one for the teaching of each subject. Adjoining each are two small 

 rooms, one the private apartment of the demonstrator or instructor for that 

 department, the other a stock-room for the supplies and preparations used in 

 teaching. A morbid anatomy cabinet also adjoins the pathological laboratory. 

 There are also a room for advanced students who desire to do original and 

 individual work, a small lecture room provided with an autopsy table with 

 alberene top, central drain and water supply, convenient sink, electric light, 



