— 86 — 



x ) Thyme oil is usually somewhat dark in colour, and the rectified oils frequently 

 acquire again in a short time the red-brown colour of the crude oil. 



2 ) This value must be considered as the lowest limit of the specific gravity. 



Thymol (Timol). Large crystals of the melting point 44 01 ) and 

 boiling point 230 . Very little soluble in water (about 1:340), readily 

 soluble in alcohol, ether, and glacial acetic acid, in fatty oils and the 

 alkalies. The aqueous solution must be neutral, and not become 

 discolored when ferric chloride is added; when heated on a water 

 bath, thymol should leave no residue. 



*) Thymol melts at 50 to 51° 



Turpentine Oil (Esencia de trementind). Colourless; d 15 o 0,85 

 to 0,87 x ); «p, according to origin, to the left or right; soluble in ether, 

 chloroform and absolute alcohol in every proportion, also in 4 vol. 

 90 per cent, alcohol, and in 12 vol. 81 per cent, alcohol 2 ). 



*) The specific gravity is also frequently higher, up to 0,877. 

 2 ) Turpentine oil dissolves in 5 to 7 vol. 90 per cent, alcohol, and in 12 to 

 14 vol. 81 per cent, alcohol. 



Chemical Preparations and Drugs. 



r Benzaldehyde. We have convinced ourselves that the products 

 described in commerce as "free from chlorine" do not always deserve 

 this designation; we would recommend purchasers to pay special 

 attention to this point, and send us samples for testing. The removal 

 of the last traces of chlorine is not such a simple matter, but is 

 necessary if the product is to be described as absolutely free from 

 chlorine. 



Benzyl acetate. This preparation, which within the last few years 

 has come greatly in favour on account of its pleasant fruity odour, is 

 also supplied by us absolutely free from chlorine, and, as we manu- 

 facture it on a large scale, we can offer it at a very advantageous price. 



Benzyl benzoate, a constituent of Peru balsam, is also well 

 introduced, and is used chiefly as a fixing agent for highly volatile 

 perfumes; it is specially adapted for this purpose on account of its 

 balsamic odour and great stability. It is also recommended as a sol- 

 vent for artificial musk. 



Citral. Improved manufacturing processes and a production on 

 a constantly growing scale enable us to meet all competition in this 

 article. The use of it is growing more and more, since the prejudices 

 have been overcome with which this body was received when we 

 discovered it some 18 years ago, and introduced it to the consumers. 



