Intelligence and Miscellaneous Articles. 77 



A mixture of 



palmitic laurostearic 



acid. acid. Melts 



parts. parts. at Form of solidification. 



100 II 0-48° F. 



10 90 106-7 uncrystalline. 



20 80 9S-7S indistinctly crystalline. 



30 70 1 00-94- small laminar crystals. 



40 60 104-18 beautiful large laminar crystals. 



A mixture of 

 stearic laurostearic 



acid. acid. Melts 



parts. parts. at Form o* solidification. 



KX>" 1 10-48° F. 



10 90 106-7 uncrystalline. 



20 80 101-3 uncrystalline, warty. 



30 70 110-12 the shining faces of small crystals 

 appearing on the surface. 



40 60 123-44 uncrystalline, warty. 



From these tables it appears that, — 



1. By the addition of any fatty acid to from 4 to 10 times its 

 quantity of another fatty acid, the melting-point of the latter is 

 lowered, even though the acid added be more difficult of fusion. 



2. The mixture of two acids differing by C 4 H 4 , which possesses 

 the lowest melting-point, consists of about 3 parts of that which 

 contains the most carbon and 7 parts of the other. 



3. The mixture of two acids differing by C 8 H 8 , which possesses 

 the lowest melting-point, consists of about 25 parts of the richest in 

 carbon and 75 of the other. 



4. The mixture of two acids differing by C w H 1 -, which possesses 

 the lowest possible melting-point, consists of about 20 parts of that 

 which contains most carbon and 80 of the other. 



5. Thus the greater the difference in the amount of carbon in 

 two acids, the smaller is the quantity of that which contains most 

 carbon required to produce the lowest melting-point. 



6. The greater the amount of carbon in two acids differing by 

 C 4 II 4 , the less is the difference between the melting-point of the 

 pure acids and the lowest point of the mixed acids. 



7. If to 9 parts of an acid C 4n II 4n 4 , we add 1 part of an acid 

 C4(n+i) f]4(n+i) O 4 , and to a similar quantity of the former also 1 part 

 of an acid C 4 n_1 ) H 4 ' n_ >) O 4 , two mixtures are obtained possessing 

 the same melting-point. The same applies, or nearly so, to mixtures 

 of 8 and 7 parts C 4n H 4 " O 4 , and 2 and 3 parts C 4 ( n +'> H 4 ( n+1 > O 4 , or 

 C4Cn-i)Hi..-i;(K 



8. A mixture of a little more than 3 parts of the acid C 4 " H 4 " O 4 

 willi a little less than 7 parts of the acid C« n+1 > H 4 C n+1 ) O 4 , possesses 

 the same melting-point as the acid C 4 " H 4n 4 in the pure state. 



The mixture of 9 parts C 4 " II 4 ' 1 O 4 with 1 part C 4 ("+') H 4 ( n +»0 4 , 

 solidifies in acicular crystals (like margaric acid). 



