THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL 



VOL. XIX. MAY, 1898. NO, 5, 



Contents. 



Making Transparent Lantern Slides from Marine Specimens 69-73 



Microscopic Inspection of Pork for Export 74-76 



Cholera, Typhoid and other Bacterial Diseases Transmitted 



Through Oysters 76-78 



PracTicai. Suggestions. — Plant Hairs of Pereanth of Shep- 

 herdia Canadensis, Mounting in Glycerine Jelly, Balsam 



Mounting, Preserving Algae 78-80 



Editorial. — Alfred Allen, Sour Corn, Plankton, Lunch 



Tablets 80-82 



Science Gossip. — Sewage Purification, Micrometer Measurer, 

 Wood, Crystals, Flora Minifera, Gold Nuggets, Manchester 

 Society, Bacteria, Zeis Objective, Peat, Protargol, Steel, 

 Sectioning Bolitic Grains, Protozoa, Phosphorescence, Fish, 

 Archffilogical, Dust, To Stick Paper on Glass, to Remove tar 



from Glass 82-86 



RECENT Publications 86-88 



Miscellaneous. — Glassworking. Duckweeds, British Associa 

 tion, D. S. Kellicott, Lessons, Suspended, Natural Science News, 

 Embryo Sissors 88 



Making Transparent Latern-slides from Marine Specimens. 



Mounting in balsam is essential so as to prevent mould, 

 attacks by mites and because they are often too opaque. 

 Some scale off from the glass and break to pieces unless 

 they are mounted. It is wise to mount several, pick out 

 the best and discard the others. 



Often the animals are simply arranged on a lantern 

 glass so as to touch it more or less completely all over 

 their under surface, then dry and drain them. Many 

 adhere round the drying edges before the central parts 

 are dry; being thus fixed they do not shrink laterally on 

 further drying but merely become thinner. If they 

 scale off later, gum them down in one or more places lest 

 they become loose when mounted in balsam. There are 

 a few animals that will not adhere to the glass and yet 



