LIST OF CONTRIBUTORS. 181 



\Y ltherill, Charles M. Examination of molybdaite of lead, from 

 Wheatley's mine near Phoenixville. P '52, 55 



Chemical investigations of the Mexican honey ant, P '52, 111 



Chemical examination of the food of the queen bee. 1* 



'52. 110 



Further examination of the Phoenixville niolybdate of lead. 



P '52, 119 



On iron crystallized from slags, and an aluminous mineral. 



P '53. 434 



- On titanium. P '53, 434 



On fused asphalt. P '53, 225 



On the action of charcoal on animal substances. P '54, 203 



Chemical notes. P '54, 233 



On itacolumite. P '67, 13 



Wetherill, Henry Emerson. A new centrifuge. P '04, 685 



Some practical color tests. P '04, 772 



Wetherill, John Price. Observations on the geology, miner- 

 alogy, etc. of the Perkiomen Lead Mine, in Pennsylvania. J v, 305 



On adipocere. P '52, 3 



On the use of phosphate of lime in agriculture. P '52. 3 



Wharton, Jos. On nickel ore at Gap, Lancaster Co., Pa. P '70, 6 



On Silver Islet, Lake Superior. P '71, 55 



On the Eucalyptus globulus. P '77, 149 



Wheatley, Charles M. Some new Pennsylvania mineral locali- 

 ties. P '82, 36 



Wheeler, William Morton. A revision of the North American 

 ants of the genus Leptothorax Mayr. P '03, 215 



Wherry, Edgar T. The copper deposits of Franklin and Adams 

 Counties, Pennsylvania. P '10, 454 



White, Chas. A. Description of new species of fossils from 

 Paleozoic rocks of Iowa. P '76, 27 



— — Descriptions of new species of invertebrate fossils from the 

 Carboniferous and Upper Silurian rocks of Illinois and Indiana, 

 P '78, 29 



On new generic forms of Cretaceous Mollus-ca and their 



relation to other forms. P '87, 32 



On the Cretaceous formations of Texas and their relation 



to those of other portions of North America. P '87, 39 

 Wickersham, C. P. On fossil footprints. P '46, 120 

 Wilcocks, Alexander. Remarks on optical illusions. P '58, 19 



On the color of stars. P '63, 26 



Reflections upon the nature of the temporary star of the 



year 1572. An application of the nebular hypothesis. J IV, 309 



