IDO 



red cry.stalline substance. They are both insohil)le in -vrater, sohibh^ 

 in auiyl alcohol, and very soluble in ether; and both are decolorized 

 by chlorine water or bromine Avater. Cold alcohol dissolves the red 

 crj'Stals Ijut slijihtly, Avhile the yellow coiui)ouii(l is very soluble. 

 Hydrochloric acid has no action on either compound. 



The juice of the fruit has a specific gravity of 0.01833 at lo'^ C, and 

 is laevorotatory. It contains a yellow colorinj; matter Avhich diflV'rs 

 from that of the pulp in being solnble in Avatcr. insolnble in alcohol, 

 ether, chloroform, and light petroleum, and in not being decolorized by 

 chlorine water or bromine wat<'r. Tlic acidity of the jnice is said to be 

 due chiefly to citric aci<l. The juice also contains a small amount ot 

 an alkaloid, which, as well as the acid, decreases as the fruit ripens. 



The following table shows the percentage composition of the dry 

 matter in the skin, inilp, juice, and seeds: 



Composition of different parix of the tomato. 



Slcin . 

 Pulp . 

 Juice. 

 Seeds - 



Wilier. 



Per tent. 



.19. r* 



93.6.1 

 97.56 

 46.30 



Composition of dry matter. 



Organic 

 matter. 



Per etnt. 

 99.20 

 89.56 

 74.52 

 95.56 



Asb. 



PfT emt. 



0.80 

 10.44 

 25.48 



4.40 



Proteids. 



Per cent. 



1.85 



1.5.15 



21.80 



25.40 



Carbohy- 

 drates' 

 and fat. 



Per rent. 

 07. 0.'. 

 7^.41 



70.16 



• Includes the acid. 



The carbohydrates of the skin are chiefly in the form of cellulose. 



The following analyses are given of the whole fruit collecte«l in Sep- 

 tember, 188S, and August. ISS!). The first samples were unripe and 

 the second rijie. 



Composition of trholc tomatoes. 



Unripe 

 fruit. 



Percent. Percent 



Ripe 

 fruit. 



The percentage composition of the ash was as follows; 



rotassinm oxido .~>9. 1(> 



Sodium oxido .">. 99 



Calcium oxide 1.34 



Majjnosium oxide 1^.09 



Ferric oxide 0. 22 



riiosjdioric ;icid 12.93 



Siilpliurii' acid 3.19 



Silica 0.27 



Chloriue 19.14 



