•] 



MICROSCOPICAL JOURNAL. 



133 



which soon displaces the air from the 

 diatoms. Then apply a little balsam 

 to the edge of the cover and a bit ol 

 blotting paper to the opposite edge. 

 This draws away the benzine, and liie 

 balsam follows and takes its place. 

 Another plan is to gum a piece of good 

 cream-laid paper on the slide, centre 

 on the turn-table, and make two cuts 

 through the paper, removing the mid- 

 dle and outer portions and leaving a 

 rim of paper to form a cell as large 

 as the cover ; then cut two small 

 openings in opposiies of the ring, gum 

 the top of the cell, and place the pre- 

 pared cover on the gummed surface. 

 When dry apply the benzine to one 

 of the small sluicegates, and then 

 balsam as before. Put the slide in a 

 warm place for several days, and fin- 

 ish ott with white, black, or colored 

 varnish to fancy. Winter is the best 

 time for dry mounts, as the breath 

 dries off too soon in hot weather ; and 

 summer is the best time for balsam 

 mounts, as it is diiiicult in the winter 

 to keep the breath from moistening 

 the isinglass at the wrong time. The 

 cement-cells should be quite dry and 

 hard betore mounting, or a dewiness 

 will appear and rum the object. 

 Soften the cement over the lamp, 

 press the cover down till it sticks all 

 round, let stand a day or two and fin- 

 ish off. No doubt the diatoms would 

 be more secure if burnt on the cover 

 in the dry mounts, and possibly that 

 process would be sufficient for the 

 balsam mounts without the film of 

 isinglass, as stated on p. 68 of Davies' 

 "Manual of Mountings." 



EDITORIAL. 



— Dr. E, Klein has observed a pink 

 Tornla, which appeared in a solution of 

 pork broth with wnich he was conducting 

 some culture-experiments. It appeared 

 to be identical with cells of Sacckaromy- 

 ces cerevisice^ or common yeast, but when 

 seen in masses they have a pink color. 

 Under the microscope they do not appear 

 colored. The color only develops ni the 

 cells that are exposed to the air — those 

 growing beneath the surface are quite 

 colorless. 



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