165 



est, 3d and 4th longest. Top of head cinereous black. Hind 

 head, nape, along superciliary ridges to base of bill scarlet. A 

 patch of the same from base of lower mandible along ramus to 

 angle of lower jaw. Space between eye and bill, and extending 

 under eye to side of neck, greyish with darker bars, growing more 

 distinct towards neck. Chin black, spotted with white. Neck, 

 breast, abdomen, upper and under tail coverts and flanks olive, 

 transversely barred with yellowish white. Back, upper wing coverts, 

 outer edge of secondaries and outer edge of primaries olive. Two 

 outer tail feathers yellowish, others black with some yellowish near 

 upper part. Iris hazel. Legs bluish. Bill horn-color. 



Dr. C. T. Jackson read a description and analysis of 

 Yttrocerite, from Worcester County, Mass. 



It was found by Prof. Hitchcock among some geological speci- 

 mens from Worcester Country. The precise locality is unknown. 

 This mineral was suspected to be Yttrocerite from its resemblance 

 to a specimen of that mineral from Sweden, sent to Prof. H. by 

 Frederic Tamnau, of Berlin. A brief notice of it was read by 

 Prof. H. at the last meeting of the Association of Geologists and 

 Naturalists at Albany. Since that time a portion of the specimen 

 had been sent to him for description and analysis. 



It occurs in narrow veins in quartz and albite, containing silvery 

 white mica and a few red garnets, and pink fiuor spar. 



Thickness of the veins from 3 to 4 millimetres. They run ir- 

 regularly through the rock, and invest the quartz in very thin 

 layers. The mineral also penetrates the felspar and fluor spar 

 communicating a pink color. 



It is massive, with some traces of crystalline structure. 



Color — Violet blue, inclining to grey or lilac. Thin laminae on 

 the quartz translucent and of a delicate pink color. 



Hardness — 4J of the scale of Mohs. 



Specific Gravity — 3.076. 



Lustre — pearly ; streak and powder greyish white. Before the 

 blowpipe, alone on charcoal, turns yellow ; fuses, at a full red 

 heat, into a greenish yellow porous glass or slag, which becomes 

 lighter colored when cold. 



With carb. soda O. fl. fuses into a yellow green opaque enamel. 

 R. fl. becomes nearly white when cold, but remains opaque. 



With borax dissolves readily into a transparent glass, which is 



