CHEMISTRY — RICHARDS, TINGLE. 157 



earlier stages ; it will be greatly helped by the large liquid-air plant of 

 improved construction nowbeing installed by the chemical laboratory. 

 A considerable balance of the grant still remains. This will be 

 used during the coming winter in the prosecution of investigations 

 2, 4, and 5, and especially in the determination of several other 

 atomic weights with the greatest possible precision. 



Tingle, J. Bishop, Johns Hopkins University, Baltimore, Maryland. 

 Grant No. 40. Investigation of derivations of camphor and allied 

 bodies. (For first report see Year Book No. 2, p. xxxiii.) $500. 



Dr. Tingle's work will be continued for some time. He presents 

 the following abstract of a paper on " Condensation Compounds of 

 Camphoroxalic Acid and Amines," which appeared in the American 

 Chemical Journal, vol. 34, page 217 (1905;. 



Camphoroxalic acid yields three classes of metallic salts, those in 

 which the carboxyl group is affected, those in which the hydroxyl 

 hydrogen is replaced, and those in which both hydroxyl and carboxyl 

 participate. They are represented by the formulae 



/ C : COHCOOM / C : COMCOOH / C : COMCOOM 



C.H„<I C» H »\io C ' H »\^0 



respectively, where M equals one atom of a monovalent metal. The 

 salts of silver, barium, and calcium belong to the first class, that of 

 ferric iron to the second, while copper forms a salt of the third type. 

 This last class of salts is believed to be entirely without analogy ;. 

 no compounds of similar structure have ever been described. 



Camphoroxalic acid condenses with a number of amines. One of 

 the objects of this investigation was to endeavor to ascertain the limits 

 of the reaction and the cause of its inhibition in certain cases. Three 

 classes of compounds have been obtained from camphoroxalic acid 



^C:CCOOH 

 and certain amines, viz, acids of the type C 8 H U nhr ■ sa ^ ts °* 



C:CCOONH 3 R 

 these acids, such as C 8 H U ^ ^HR > and compounds of the for- 



^C:CH 

 mulae C 8 H U | ^HR. (R=a hydrocarbon radical.) 



Some amines form compounds of all three types ; other amines only 

 yield derivatives belonging to one or two. The amines which react 

 in this manner are a- and /3-naphthylamine, meta- and para- toluidine. 



