328 A MANUAL OF BACTERIOLOGY 



pound respectively to' sterilise 1 litre of nutrient 

 gelatine. 



The author 1 has shown that a saturated solution 

 of salicylic acid destroys Sarcina lutea, M. prodigio- 

 sus, Bacillus tuberculosis, Bacterium allii,M.tetragonus t 

 Bacterium lactis, Bacterium aceti, M. aurantiacus, 

 Bacillus subtilis, Leptotlirix buccalis, M. urece, Bacillus 

 butyricus, etc. It should be borne in mind that 

 salicylic acid is a more powerful germicide than 

 sodium salicylate; and that the natural salicylic 

 acid is a more powerful germicide than the artificial 

 variety. 



Koch has proved that a 3 per cent, solution of 

 carbolic acid completely destroyed the spores of 

 Bacillus anthracis in seven days, while a 5 per cent, 

 solution destroyed them in two days. A 1 per cent. 



chains in benzene derivatives by numerals, the terms ortho-, 

 meta-, and para-compounds are readily understood : 



1 



4 



The term ortho- is always applied to the positions 2 and 6 in 

 relation to 1. 



The term meta- is always applied to the positions 3 and 5 in 

 relation to 1. 



The term para- is always applied to the position 4 in relation 

 to 1. 



1 Proc. Roy. Soc., Edinburgh, vol. xiii. p. 527; vol. xiv. 

 p. 97 ; vol. xv. p. 37 ; vol. xvii. p. 257 ; and Researches on 

 Micro-Organisms, p. 223 seq. 



