1828 Journal of Applied Microscopy 



oration may be prevented by placing over the mount a bell-jar lined with moist 

 filter paper. — Bot. Gaz. 32 : 5. 



In a report to the U. S. Department of Agriculture, Mr. W. R. Beattie 

 describes a plan for freeing a botanical laboratory from a plague of cockroaches or 

 other insect pests. The agent used is hydro-cyanic acid gas, liberated by the 

 action of dilute sulphuric acid on potassium cyanide, about 1.5 gr. of the latter 

 being used per cubic foot of the building. The sulphuric acid is placed in glass 

 jars, above each of which is fixed a pulley. A line passing over this pulley car- 

 ries the packet of cyanide, which may thus be lowered into the acid from the 

 exterior of the building. All outside openings are closed as far as possible and 

 the cyanide being lowered into the acid, the building is left to itself for at least 

 three hours. The insects leave their hiding places as the fumes reach them and 

 die on the floor where they may be swept up. — Eng. Mech. and W. of Sci. 74 : 

 1901. 



Hatai's Fluids for Fixing Spinal Ganglion Cells. — Hatai studiedjj^the 

 ganglion cells of the rat and found the following solutions more satisfactory than 

 any used, among which were Carnoy's, Ewing's, Leuhossek's, Graf's and Gilson's 

 fluids : 



I. Corrosive sublimate, sat. sol. in formalin G parts 



Glacial acetic acid 10 parts 



Normal salt solution 8 parts 



II. Picric acid, sat. sol. in 10 per cent, formalin 8 parts 



Glacial acetic acid 1 part 



Corrosive sublimate 1 part 



In using either of these fluids the following procedure is recommended : 



1. Allow to remain in solution six to twelve hours. 



2. Wash in running water four to five hours. 



3. Wash in weak alcohol (80 per cent.), after which the usual paraflfin embed- 

 ding method is pursued. 



In staining after this fixative, thionin, toluidin blue, and methylen blue gave 

 best results. — Jour. Comp. Neurology, II: 1. 



Through an oversight the proper heading for the review on page 1771 of last 

 month's Journal was omitted, leaving the reader in doubt as to the source of 

 the matter reviewed, the subject of the review, which began in the February 

 number, being Vol. XXII of the Transactions of the American Microscopical 

 Society. 



Books Received. 



Annual Report of tbe Smithsonian Institution, 1899. U. S. National Museum. 



The Etiology of Yellow Fever. Reed, Carroll, and Agramonte, 



Transactions of the American Microscopical Society, Vol. XXII. 



Twelfth Annual Report of the Missouri Botanical Garden. 



Flowers and Ferns in Their Haunts. Mabel Osgood Wright. 



Methods in Plant Histology. Charles J. Chamberlain. 



Index Catalogue of the Library of the Surgeon-General's Office, U. S. Army. Sec- 

 ond Series, Vol. VI. This volume includes 15,589 author's titles, representing 

 5,865 volumes and 14,296 pamphlets. It also contains 5,962 subject titles of 

 separate books and pamphlets, and 30,561 titles of articles in periodicals. The 

 library now contains 138,078 bound volumes and 235,127 pamphlets. 



