Journal of Applied Microscopy. 341 



conditions present. The hospital pathologist, after completing an analysis and 

 noting it, separates the sheet at the perforation, sends it to the ward, and retains 

 the carbon copy in the book, where it may be referred to at any time." The 

 volume is serviceably bound in oilcloth, which is not injured by accidental contact 

 with fluids, and it may be washed if soiled. It contains in the back an alpha- 

 betical index for patients' names. l. b. e. 



c • * t Ai/ II T .• A/r-11 o ,.1 u. vrr. Thls Is a wcll arranged manual for 

 Farrington & Wall. Testing Milk and its Pro- » 



ducts. Mendota Book Co., Madison, Wis., practical use in testing milk. It gives 

 '^9^- full descriptions of the different meth- 



ods of making tests, with the apparatus used, and in addition there is a chapter on 

 the composition of milk and its products, and a chapter with directions for making 

 chemical analyses. There are also methods and tables for calculating dividends, 

 and many suggestions of practical use to the dairyman. e. m. b. 



The second edition of Dr. Novy's 

 Novy, Frederick G., M, D. University of Mich- ,^, ,,7 i i, • ^i i ^j 



igan. Laboratory Work in Bacteriology. " Laboratory Work IS greatly enlaiged 

 Second Edition. George Wahr, Ann Arbor, ^nd provided with many new illustra- 

 . ''^ ' ' ^^' tions. The work is intended as a text- 



book of laboratory work for medical students, and conforms closely to the actual 

 work in Dr. Novy's classes in the Hygienic Laboratory of the University of 

 Michigan, which, in itself, is enough to make it of interest to every bacteriologist. 



L. B. E. 



Permanent Mounts of Pollen. — When only external characters are 

 desired, very beautiful permanent mounts can be made in the following manner : 

 Put a drop of albumen fixative on the slide and spread it out in a thin layer. 

 Sprinkle the fresh pollen on this and then put the slide into a stender dish of 

 absolute alcohol to which equal parts of a small amount of anilin safranin and 

 gentian violet have been added. About O.I gram of each to 100 cc. of the 

 alcohol is the proper amount. After five or ten minutes transfer to xylol, and 

 when cleared mount in Canada balsam. John H. .Schaffner. 



Botanical Laboratory, Ohio State University. 



Concerning Fresh Water Aquaria. ^Mr. Piper's suggestion in the 

 January number of the Journal, while effective for the purpose he claims, 

 seems to possess no advantages over a plan I have adopted for some years, viz., 

 to cover the surface of the water with Salvinia natans. This floating plant 

 effectually protects the surface from the accumulation of bacterial zoogloea, 

 although the Salvinia itself is continually attacked by moulds ; it is so energetic, 

 however, in its growth that its decay is not proportionate to its increase. In 

 one of my aquaria containing vigorous plants of Cabomba rosae-folia and Caro- 

 lineana, and whose surface is covered with the Salvinia, the algae Spirogyra 

 and Cladophora are exceptionally prolific; in. another containing a great mass 

 of the aquatic moss, Amblystegium riparium, and with an uncovered surface, I 

 am unable to grow any algae. Doubtless, plants such as Azolla or Lemna would 

 perform the same functions, but these both have their periods of decay when 

 they disappear altogether, while the Salvinia is in evidence the year around. 

 Fort Hamilton, N. Y. A. H. GARDNER. 



