42 IMMEDIATE PRINCIPLES OF THE TISSUES. 



vine, lachrymine, spermatine, organic substance peculiar to dropsi- 

 cal effusions, paralbumine, pyine. 



II. Substances known to exist, but doubtful as immediate 

 principles. 



1. Of the first class ; ammonio-sodaic phosphate ; phosphate of 

 ammonia ; ditto of iron ; chloride of calcium, of magnesium, and of 

 iron ; arseniate of lime. 



2. Of the second class ; tartrate of iron : benzoic acid, and ben- 

 zoates of soda, potassa, lime, and ammonia ; glycocol ; hippurate 

 and lactate of ammonia ; succinate of soda ; urostealite, xanthocys- 

 tine, urate of iron, sulphocyanuret of potassium, and of sodium ; 

 formic acid ; a peculiar crystallized principle in semen ; butyric 

 acid; uroglaucine; inosite. 



3. Of the third class ; phymatine ; hydatidine ; animal substance 

 of calculi ; fibralbumine ; cyanurine ; melanurine ; coloring matter 

 of blue suppurations. 



III. Certain simple bodies whose actual state of combination is 

 unknown, or not generally indicated : iron, copper, lead, 

 manganese, arsenic, sulphur, and the carbon of the lungs. 

 These are also termed medicinal principles. 



IY. Certain natural and artificial chemical compounds which 

 are not immediate principles. And 



Y. Substances called immediate principles ; but which either 

 do not exist at all, or do so as mixtures or products of 

 chemical changes. 1 



First Group. 

 CLASS FIRST. 



IMMEDIATE PRINCIPLES OF MINERAL ORIGIN. 



All these principles have a definite chemical composition, the 

 formula for which will be given with the rapid description of each 

 of them which follows. 



1 For these two lists, see Am. Med. Monthly for March, 1855. 



