CHAPTER II. 



SCIENCE IN THE OPEN AIR APHIDES EVAPORATION BY LEAVES AN 



AQUARIUM THE CATALEPTIC FOWL NEEDLE POINTS AND THORNS 



MICROSCOPIC AQUARIUM CAPE GRISNEZ CRYSTALS ICE ON 



THE GAS LAMPS. 



SOME years ago we were staying in Normandy, not far from the town of 

 C , enjoying, in the midst of most cordial hospitality, the peacefulness 



Fig. i. Ants engaged in extracting aphides from a rose-tree (highly magnified) 



of country life ; and my kind hosts, with me, took great pleasure in having 

 what, we called "a course of science in the open air." The recollections of 

 that time are some of the pleasantest in the whole course of my life, because 

 all our leisure was intelligently occupied. Each of us set himself to provide 

 the subject of some curious observation or instructive experiment ; one made 



