) — 135 — 



kept 24 hours in a water plug-bath at about 38°. If, after that lapse of time, 

 the lead-paper was found to be blackened, it was evident that the tube 

 in question did not contain a sufficient proportion of the antiseptic. As 

 a series of test-tubes was always being treated with an increasing quantity 

 of antiseptic, it was easy to determine exactly when the limit of con- 

 centration was reached at which the activity of the bacteria was impeded 1 ). 



Experiments in narcosis, made on fishes. 



Substance 



Dilution 



Mustard oil (allyHso- 



sulphocyanate) 



Cinnamon oil 



Citral . 



Carvacrol 



Thyme oil 



Carvone 



Sandalwood oil 



Eugenol . 



Anethol 



Greek turpentine oil . . 

 French „ „ . . 



Spanish „ „ . . 



American „ „ . . 



Calamus oil . . 



German peppermint oil . 



Russian anise oil 



Clove oil . . . . 



Mitcham peppermint oil 



Caraway oil 



Safrol 



Heliotropin 



Heptylalcohol 



Rose oil 



Lavender oil 



Mace oil 



Octylalcohol 



Geraniol . . . 



1:1320000 

 180 000 

 153 846 

 134 010 

 133 333 

 125 918 

 116 327 

 111836 

 104 587 



86 405 

 79 493 

 77 304 

 77 304 

 71862 

 70 000 

 67 000 

 67 000 

 66 666 

 62 500 

 60 560 



45 454 

 45 000 

 41 715 

 38 764 

 38 527 

 38 090 

 37 500 



Substance 



Dilution 



Fennel oil . . 1 : 34 535 



Terpineol (liquid) ..... | 32 000 



Coumarin .........; 28571 



Turpentine oil, fraction 



containing /?-pinene . . 28 000 



d-a-P'mene j 26 806 



Borneo camphor j 26 087 



Eucalyptol (Cineol) . . . ! 22 000 



Z-a-Pinene 20105 



■ i 



Benzaldehyde ....... \ 18096 



Oenanthol 16 788 



Menthenone j 16 000 



Umbellulone ^ 15 000 



Eulimene (artificial 



limonene) j 13 000 



Rosemary oil .- 13 333 



Juniperberry oil 11 320 



Cymene 10 965 



Terpineol (cryst.) 10 554 



Anisic aldehyde 10 164 



Lemon oil 9 157 



Chloroform . 8 070 



Fenchyh'sovalerate . , . . i 6 345 



B o my Uso valerate 6 300 



Limonene 1 040 



Chloral hydrate 286 



Alcohol 190 



Ether . . . ' 166 



x ) The evolution of sulphuretted hydrogen from milk diluted with sulphur is due to 

 bacterial action. 



