1853.] 813 



Troglodytes ludovicianus, Bonap. 



I met a single wren of this species, July 5th, 1852. Undoubtedly nests 

 sparingly in the southern part of the State. Rare. 



Regulus calendula, Liiin. 

 Abundant spring and fall. 



Regulus satrapa, Lichst. 



Abundant. Arrives 1st of April, and remains until May lOth. 



SiALiA Wilsonii, Swains. 



The first arrival of this harbinger of spring at Racine, was 



^To be continued.) 



The Committee on Dr. Heermann's "Catalogue of tlie Oological 

 Collection in the Academy of Natural Sciences of Philadelphia," 

 reported in favor of publication in the Proceedings. (0^^ See end of 

 this number.) 



The Committee on Lieut. Maury's communication, containing his 

 observations on atmospheric pressure, reported as follows : 



Lieut. M. F. Maury, through Dr. Le Conte, the Corresponding Secretary, 

 presented an engraved diagram, representing a " vertical section of the basin 

 of the Atlantic," about the parallels of 39 and 40 north latitude, the data for 

 which drawing are furnished by the deep sea soundings, taken by officers of the 

 17. S. Navy, in obedience to an order /rom the Navy Department. Lieut. 

 Maury says, " These data are not very abundant, but such as they are they 

 give a proximate idea as to the submarine depression." 



The diagram exhibits a striking contrast between the profile of the earth's 

 crust above and below the sea level. 



The same plate represents a vertical section across the continent of South 

 America from Lima, on the Pacific, to the mouth of the Amazon under the 

 equator, on the Atlantic. 



The object of this part of the engraving is to illustrate certain anomalies in 

 the pressure of the atmosphere, as inferred from the experiments of Lieut. 

 Herndon, U. S. Navy, on the boiling point of water, during his recent journey 

 across that section of the continent. The following extract from a table 

 shows the boiling points at several places on the route, and their eleva- 

 tions above the sea respectively : 



