^14 XATURE STUDY IN SCHOOLS. 



From hillside fields and valleys low 

 The asters gaze with starry eyes, 



And from the meadows by the brook 

 The blue-fringed gentians rise. 



They rise and ope their fairy bells 

 When the goddess draweth nigh ; 



And each azure cup in brightness vies 

 With the azure of the sky. 



And stooping low as soft she treads 



Beside their humble bower, 

 October gives her sweetest kiss 



To New England's fairest flower. 

 Then silently and viewlessly 

 : Onward the goddess moves. 



PLAN OF AERIATING MACHINE FOR AQUARIUMS. 



BY 



Prof. Arthur. M. Miller. 



My device is my own and quite inexpensive. I first thought of getting 

 a plummer to put me in a blower to be run by the hydrant pressure, but 

 foundthat it would cost me about $75. Mine, made entirely cf glass and 

 rubber tubing, a glass jar of about three quarts capacity, syringe and bicy- 

 cle valves and pieces of grape-vine twigs, did not cost me in mateiials two 

 dollars. I have piped the air over a doorway and all along one side of a 

 room, where it supplies air to six jars. By turning on more water at the 

 stop cock, I could increase the number of jars indefinitely. 



There is no secret about it. Some of my colleagues have admired it, and 

 I have been urged to write a description for some of the Naturalist's Jour- 

 nals. I enclose a sheet containing a diagram of it, with the dimensions 

 obtaining in mine. Those of course could be varied within certain limits. 



The water is admitted to jar J through tube A. The filling of the jar 

 drives out the air through tube D. The height of the siphon tube C, deter- 

 mines the amount of air pressure it is possible to obtain. The water rises 

 in the tubes C and B at about the same late. When the jar fills up to 

 mouth of air tube D, it rises rapidly in all three of these tubes, but not so 

 r apidly in the air tube D as in the others, on account of the resistance to 



