42 THE REGISTER. 



peratures, of atmospheric pressure, of moisture, &c., as well as 

 thermometrical, barometrical compasses, or circles, &c. 



These graphic representations are of the greatest utility for 

 the comparisons, speaking to the eye more clearly than simple 

 figures. 



Besides the above directions for keeping an ordinary Meteor- 

 ological Journal, more special instructions for the study of pecu- 

 liar meteorological phenomena are prepared by the Smithsonian 

 Institution ; as on 



Thunder-storms, Tornadoes, and Water-spouts, Aurora Bore- 

 alis, Parhelia, Parasalenes, Haloes, Rainbows, Temperature of 

 the soil, Periodical phenomena of the vegetable and animal 

 kingdoms, Graphic representations of meteorological phenomena, 

 &c. If any observer should feel inclined to devote himself to 

 the study of any one of these physical problems, he may receive, 

 on application, the special instructions relating to the point 

 which he wishes to investigate. [These instructions now form a 

 part of this pamphlet.] 



[The directions given in the preceding article are not intended 

 to supersede those printed on the sheet of blank forms issued 

 jointly by the Smithsonian Institution and the Patent Office, 

 but to impart additional instruction, particularly to those who 

 are furnished with a full set of instruments and desire to attain 

 as much precision as possible."] 



