Burnett on Organic Relations of Infusoria, etc. 319 
and line it with horsehair, cotton, &c. Their structure is so 
slight and transparent, that their eggs may be seen through 
them from beneath. They are from two to four, of a reddish 
white, with a circle of ash-gray, violet color, and dusky spots 
on the large end. Diameter, 0.026 m. in length, 0.018 m. in 
breadth. 
Trogon Temnurus Temm. Tocoloro. This beautiful bird 
does not trouble himself about building a nest, but seeks the 
deserted habitation of some Woodpecker. From April to 
July is the breeding season, and the eggs are three to four, of 
a white color, with a bluish tinge. Diameter, 0.031 m. in 
length, 0.024 m. in breadth. 
Saurothera Merlini D'Orb. — Arriero. On coffee trees and 
other branchy shrubs, this species builds its nest, without any 
art or cunning, its materials being merely twigs, lined with a 
few dry leaves. The three eggs are of a dull white, with some 
brownish spots, which, I think, appear after the eggs are laid. 
Arr. IV. — The Organic Relations of some of the Infusoria, 
including Investigations concerning the Structure and Na- 
ture of the Genus Bodo (Ehr.) Read before the Boston 
Society of Natural History, November 5th, 1851. By 
W. I. Bunxerr, M. D. 
Tre changes which we are now experiencing as to our 
views of the nature of minute organisms, must be regarded 
as a sign of the advancement of our knowledge in more than 
one direction. The removal of obscurities in these depart- 
ments is a matter of more difficulty and importance than is 
generally supposed, and is indicative of the possession of 
ampler and better means of observation, combined with clearer 
views of the relations of organic life. This is particularly 
true of the subject of Infusoria; which, although in a more 
