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One of us (W.W.) gratefully acknowledges the Austrian-American Fulbright Commission for the receipt of a travel grant. The Camille and Henry Dreyfuss Foundation is thanked for partial support of the X-ray spectrometer. This work was supported in part by National Science Foundation Grant No. CHE-7618385.

The silver-calcium system has been reinvestigated over the wholecornposition range by thermal analysis, X-ray diffraction, and metallography. A novel technique has been used to prepare and examine these reactive alloys. In the course of this project four intermetallic compounds have been observed for the first time; ~vliiie two others, viz., Ag,Ca and AgCa, which were reported before by others, have been confirmed. Three of the new co~npounds areTAg,Ca,, Ag,Ca,, and AgCa3, while the fourth was not isolated or examined in detail. Two other compounds which were described in earlier work as Ag,Ca and Ag,Ca, have been found to be Ag,Caz and Ag,Ca,, respectively. Major n~odifications have been made in the liquidus curve and possible reactions in the solid state are indicated.

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