A new micromelting-point apparatus

NOTES THE

FROM

ISOLATION

THE

U. S. BUREAU

AND

PROPERTIES

AND OIL OF LARKSPUR

OF CHEMISTRY.“’ OF

SEED (DELPHINIUM

THE

ALKALOIDS

CONSOLIDA).

By L. N. Markwood. [ATISTRKT.]

THE pure oil of larkspur seed has been isolated and described. There have also been isolated two crystalline alkaloids, the compositions of which have been definitely established, and a third crpstalline alkaloid, which has not yet been obtained in a pure state. Of the former two, delcosine (C,,H,,NO,), melting point I@-199” C., is identical with a product previously obtained, while delsoline (C,,H,,NO,) , melting point 207--209’ C., is an addition to the list of larkspur constituents. ___ THE OPTIMUM REACTION RANGES OF CROP PLANTS.’

By E. T. Wherry. [ABSTRACT.]

STEPS are being taken to determine the optimum reaction ranges of important crop plants and methods of bringing the soil reaction of the land on which they are to be grown within this range. Previous experiments have yielded fictitious optimum reactions for individual plants, in that secondary physiological disturbances such as chlorosis have been caused by the methods used, but the effects of these disturbances have been concealed by The subject should the use of the pH method of stating reaction. be further studied by methods free from these objections. ___ A NEW MICROMELTING-POINT APPARATUS. By J. F. Clevenger. [ABSTRACT.]

A NEW micromelting-point apparatus permits direct observation of individual crystals by the microscope while the melting point is being determined. Accurate melting temperatures up to by the use of this apparatus. 400’ C. may be determined *Communicated by the Chief of the Bureau. ’Published in J. Am. Pharm. Asso., 13 (Aug., 1924) : 696. ‘Published in Ind. Eny. C~CJJL, 16 (Aug., 1924) : 826. a Published in Znd. Ecg. C~E?JI.,16 (Aug., 1924) : 854. 561