1887.] NaW YORK ACADEMY OF SCIENCES. Ill 



hope that he may be spared for a long life of usefulness, of which 

 his father has furnished such an excellent example. 



The following papers were read by title : 



DESCRIPTION OF A NEW SPECIES OF THRUSH, (mARGAROPS 

 ALBIYENTRIS) FROM THE ISLAND OF GRENADA, W. I., 



BY George N". Lawrence. 

 (Published in the Annals, Vol. IV.) 



MONOGRAPH OF THE NORTH AMERICAN IULIDJ5, 



BY Charles H. Bollman. 

 (Published in the Annals, Vol. IV.) 



Mr. George F. Kunz exhibited a pectolite hammer from Pt. 

 Barrow, Alaska, made of a fragment of a pectolite boulder. In 

 color it is a light grayish-green, resembling jade. It had not been 

 rubbed or polished except at the breaking edge and on the side 

 where the handle is attached. The material is very compact and 

 tough, and is similar to that which was supposed to be jade 

 until it was identified by Prof. Clarke's analysis. A small groove 

 has been made at the point of greatest resistance to receive a 

 thong which binds the handle to the head. The handle is of 

 reindeer bone, 15 cent, long,, and is secured to the head by 

 means of spliced reindeer sinews, which pass ten times round 

 the head and through a perforation in the handle, thus binding 

 the two parts together with wonderful firmness. The sinews 

 were evidently wet when the work was done. Although made 

 by a savage, this hammer is as light, symmetrical, and strong for 

 the purpose (crushing bones), as any skilled artisan could pos- 

 sibly make out of whatever material. It would be difficult to 

 conceive a hammer in which the force of concussion would be 

 more evenly distributed through the head, and although the 

 fastening is light it could be still lighter. 



Mr. Kunz also exhibited specimens of, and remarked as fol- 

 lows upon 



HYDROPHANE (magic stone) from COLORADO. 



A white, opaque variety of hydrophane has recently been 

 brought from some Colorado locality, which is quite remarkable 



