Resins in the Milk of the Cotsc-Tree, 291 



hoi of 0*833, and the quantity of which fully agrees with that 



required by theory. Three atoms are decomposed, giving 

 2 atoms AqC = 2 (4C 4H 40) + 2 Aq, and 

 1 atom Aq AFc = (4C 2H 3 0) + Aq 

 The salt 2 Na Ci -h Na Ate is a chemical compound, which 



when dissolved in water attracts one atom of water, and forms 



three atoms of citrate of soda, &c. 



Milk of the Cow-Tree. 



We are indebted to Dr. Marchand for an examination of 

 the milk of the cow-tree {Palo de Vacca). This vegetable 

 milk had already been made the subject of inquiry by Bous- 

 singault and Boldero {Ann.de Chim. et de Phys. xxiii. p. 210), 

 and by E. Solly, Jun. (L. & E. Phil. Mag., xi. p. 542), with whose 

 paper Marchand appears to have been unacquainted. Solly's 

 galaclin seems to have been a mixture ; he had, however, like- 

 wise recognized its difference from wax. According to the 

 present examination, this milk would consist of water, ferment- 

 ative sugar, lime, magnesia, combined with phosphoric acid, 

 acetic acid (traces), butyric acid (?), resin C'^ H"^ O, resin 

 C-20H32O, resin C^'-H^O, so-called wax (Solly's galactin?), 

 a substance resembling caoutchouc, C^' H' "^ O^. We find, 

 therefore, in the milk of the cow-tree only those substances 

 which the milky saps of plants generally contain, but espe- 

 cially litde albumen, and much of a caoutchouc-like substance. 

 The resins are all compounds belonging to the radical C* H«. 



1. Resin C'" H'e O = 2 (C' H^ O. The same composition 

 as copaiva resin (according to Hess, however, this is com- 

 posed of C^H'^^O^). 



2. Resin C^" H^- O = 4 (C* H^) O. Camphor oil, accord- 

 ing to Martins, possesses the same composition. In the wax 

 of Ceroxylon andicola Boussingault found a resin to which he 

 likewise assigns this formula. Perhaps Mulder's anthiar 

 resin is the same. 



3. Resin 0> \rV" O = 10 (C* H«) W O. This composition 

 differs so much from those of the waxes that it can scarcely 

 be reckoned in this class. 



4. Caoutchouc-like substance C^" H'"^ O^ = 8 (C'H") H^O 

 + O^. The remarkable resemblance which this substance 

 has to caoutchouc would lead one to believe that it is 

 really identical, but according to Faraday's experiments the 

 latter contains no oxygen. It is, however, possible, that ca- 

 outchouc in the state in which it is contained in the milky 

 saps is capable of combining both with water and oxyrren, 

 and thus to produce a combination which from its properties 

 calls to mind its origin. This view would agree perfectly 



U 2 



