38 
Proceedings of Roycd Society of Edinburgh. [dec. 5, 
Tube No. II. contained, in addition to the nutrient agar-agar, 
3 per cent, of salicylic acid. 
Tube No. III. contained, in addition to the nourishing medium, 
0’5 per cent, of potassium iodate. 
Tube No. IV. contained, in addition to the sterilised agar-agar, 0*4 
per cent, of sodium fluosilicate. 
B — A growth of Micrococcus 
prodigiosus in nutrient 
agar-agar. 
C. — Appearance of nutrient 
agar-agar (inoculated) in 
each tube after the addi- 
tion of the antiseptics 
mentioned in this paper, 
and after twenty-days 
incubation at 34° C. 
Fig. 3. — Micrococcus prodigiosus. 
Tube No. V, contained 1 milligramme of iodine in 100 c.c. of 
the medium. 
Tubes Nos. II., III., IV., and Y. did not develop any growths 
after twenty-five days’ incubation at a temperature of 34° C. After 
this period had elapsed, sterilised platinum needles were plunged 
into each tube, and were then transferred to four tubes containing 
sterilised nutrient agar-agar. No growths made their appearances 
in any of the tubes after the elapse of three weeks. All the above 
experiments were performed in duplicate with similar results. 
