7*6 Intelligence and Miscellanediis Articles. 



The third acid is margaric acid. Heintz procured it by numerous 

 recrystallizations of the portion of fatty acids chiefly containing it ; 

 it crystallized from alcohol in fine scale-like crystals, which soli- 

 dified on fusion in shining, interwoven needles ; its melting-point 

 was exactly 140°. 



Free acid. 



, «____—, Baryta salt. 



Found. Calc. , " . 



I « ^ Found. Calc. 



C3* 75-40 75-51 75-55 C^^ 60-18 60-46 



W* 12-70 12-59 12-59 H3^ 9-71 9-77 



O* 11-90 11-90 11-86 03 7-38 7-12 



iocToO l"00^ 100-00 Ba0^2^ 22-65 



100-00 100-00 

 L-dstly, the fourth acid is palmitic acid ; it is the last precipitated 

 by acetate of lead from the boiling solution of mixed acids, and ap- 

 pears to be contained in the greatest proportion in human fat. It 

 melted exactly at 143°-6, and sohdified on cooling into indistinctly 

 crystallized, apparently laminar, shining masses, of a somewhat 

 pearly lustre. When it has a small portion of margaric acid mixed 

 with it, it crystallizes on gradual cooling after fusion in tufts of 

 acicular crystals. From the alcoholic solution it crystallizes in 

 small white scales. 



Free acid. 



I * ^ Silver salt. Baryta salt. 



Found. Calc. i * — i t ' » 



, A — — -, Found. Calc. Found. Calc. 



C' 74-85 74-88 74-95 75'00 C3= 62-58 52-91 C^^ 59'22 59-37 



H'2 12-50 12-51 12-53 1250 H^' 852 854 H'' 9-62 9-59 



0< 12-65 12-61 12-52 12-50 O^ 920 8-82 O' 772 7-42 



l00¥0T00?0T00^i^0^ AgJ970_2973 Ba0^3;44 ^3;62 



100-00 100-00 100-00 100-00 



Dr. Heintz considers the olidic acid procured by Varrentrapp*, 

 by the action of hydrate of potash in a state of fusion upon oleic acid, 

 to be identical with palmitic acid. 



Dr. Heintz has also investigated the composition of the fluid portion 

 of human fat. The oleate of baryta, prepared according to Gott- 

 lieb's t method, contained more baryta than accords with the for- 

 mula given by that chemist ; Heintz obtained from 22-2 to 22-5 per 

 cent, of baryta, and a corresponding deficiency of carbon. 



By repeated boilings of this oleate of baryta in so small a portion 

 of alcohol that there was never more than a part of the salt dissolved 

 at each operation, the residue contained at last as much as 22-7 per 

 cent, ^ther extracted from this impure oleate of baryta a salt 

 which contained from 27 to 28 per cent, of baryta ; the remaining 

 pure oleate of baryta gave the formula proposed by Gottlieb. 



Found. Calculated. 



C36 61-55 61-82 



H3» 9-54 9-44 



03 6-94 6-87 



BaO 21-97 21-87 



100-00 100-00 



* Annalen der Chemie und Pharmacie, liv. 124. t Ibid. Ivii. 33. 



