REPORT OF THE SECRETARY. 47 



volumes, of wliicli the first is nearly ready to be put iu tLe hands of the 

 l>rmter. This volume contains — 



Part I. Hydrography and meteorological observations at sea. 



a. Hydrographical remarks relating to Bafiin's Bay, Smith's Sound, 

 and Eobesou Channel. 



h. Temperature of the sea and its specific gravity at different depths. 



c. Ice of Smith's Sound and its motion. 



d. Tidal observations made at Polaris Bay, comi^rising eight luna- 

 tions. 



Part II. Meteorology. 



a. Temperature both at Polaris Bay and Polaris House, the second 

 winter quarters. 

 1). Effect of the direct heating power of the sun 



c. Eft'ect of terrestrial radiation. 



d. Hygrometrical observations. 



e. Atmospheric pressure. 

 /. Winds. 



g. Face of the sky. 



li= Ozone. 



*. Rain and snow. 



Part III. Psychrometrical tables, giving the relative humidity, force 

 of vapor, and dew-point for each tenth of a degree from 32° to —45°. 



Part IV. Astronomical observations. 



Part V. Magnetism and aurora. 



Part YI. Pendulum experiments. 



The second volume will be devoted to natural history, comprising 

 zoology, botany, geology, palaeontology, mineralogy, &c. 



The third volume will comprise the ethuology of the Esquimaux. 



The whole will be copiously illustrated by wood-cuts and charts, and 

 published under the auspices of the Navy Department.* 



Chemical Laboratory. — During the past two years the laboratory of the 

 Institution has been in charge of Dr. Oscar Loew, the chemist and min- 

 eralogist of the Wheeler survey, and during this time he has made 

 various analyses for the Institution of minerals, mineral waters, and 

 other substances referred to the Institution lor examination by the 

 Government and other parties. 



In behalf of the Wheeler expedition he has investigated and analyzed 

 the waters of thirty-four mineral springs of New Mexico and Colorado, 

 many soils of the arable lands of Arizona and New Mexico, rocks such 

 as basalts, rhyolites, trachytes from New Mexico, coals of various local- 

 ities in Colorado and New Mexico, lake and river deposits, mineip-ls. 

 such as turquois, garnets, zeolites, plants used for medicinal purposes 

 by Mexicans, &c., &c. 



Photograpluj. — The photographic laboratory, under the direction of Mr. 

 T. W. Smillie, has been in continued operation during the past year; a 



* For the exi)ense of the illustratious, Cougiess ajipropriated $15,000 iu March, 1875. 



