— 160 — 



almost always offensive evil-smelling sputum of sufferers from phthisis 

 with cavities. For such patients it is a real blessing if instead of turpentine 

 oil, which in the long run has a most unpleasant odour, they are 

 allowed to inhale the pleasantly smelling limonene. The method 

 of application is as follows: either 20 drops are put in hot water 

 and the vapours inhaled by means of a funnel, or water contain- 

 ing some limonene is diffused by means of a spraying apparatus. 

 Freshly distilled turpentine oil, according to my results, 

 acts as 1 in 10; turpentine oil ozonised by prolonged ex- 

 posure to the light in the air, shows, however, a decidedly 

 more powerful action, viz., 1 in 85 (Bruning, as already 

 mentioned above, found that fresh and ozonised turpentine oils have 

 exactly the same action). 



Specially powerful were, according to Brtining's and my 

 own experiments, mustard oil (1 in 2300), cinnamon oil 

 (1 in 410), cassia oil (1 in 320), isoeugenol (1 in 200), bitter 

 almond oil (1 in 190), spike oil and oil of cherry laurel 

 (1 in 185), anisic aldehyde (1 in 175), the body C 10 H 16 O 2 from 

 American wormseed oil (1 in 175), clove oil (1 in 120), and 

 benzyl alcohol (1 in 105). 



The alcohols and aldehydes have both strongly and feebly 

 acting representatives. Ethyl alcohol does not prevent the formation 

 of sulphuretted hydrogen even in the concentration of 1 in 10 as 

 compared with the milk. Of the aldehydes examined, cinnamic 

 aldehyde has the most powerful action (1 in 320). 



Conformity between the activity of essential oils and of their 

 principal constituents has been discovered neither by Bruning nor 

 by myself. For example, clove oil acts when diluted to 1 in 120, 

 but eugenol of which it contains 8o°/ , only acts as a bactericide at 

 1 in 80. The reverse is the case with wormseed oil (1 in 75) and 

 the body C 10 H 16 O 2 contained in it (1 in 175). 



Of Walbaum's l ) muskone may be said that it forms the aroma 

 of musk, is a ketone and has probably the formula C 16 H 30 O. Neither 

 muskone nor tinctura moschi arrest the formation of sulphur- 

 etted hydrogen from milk and sulphur. 



Of solids, Bruning examined heliotropin, thymol, anethol, 

 and isomyristicin; these did not prove to have an antiseptic 

 action. I examined benzoic acid, salicylic acid, borneol, 

 isoborneol, menthol, helenin, and skatol. I found that the 

 formation of H 2 S was prevented by 0,2 g. salicylic acid and 

 by 0,5 g. skatol in 10 cc. milk each. 



*) H. Walbaum, Das natiirliche Moschusaroma [The natural aroma of musk]. 

 Journ. f. prakt. Chemie II. 73 (1906), 487. 



