. Nature sketches in temperate America, a series of sketches and a popular account of insects, birds, and plants, treated from some aspects of their evolution and ecological relations . igratory birds that are caught in thetrend of a cold wave in the spring has been noticed from timeto time and is now common knowledge. The destruction ofinsects that appear early in the spring, along with the injuryto flower buds by delayed frosts, are some pf the physical effectscommonly noticed during certain seasons. Finally, elevation of temperature so as to produce the otherextreme of drought is also produ
. Nature sketches in temperate America, a series of sketches and a popular account of insects, birds, and plants, treated from some aspects of their evolution and ecological relations . igratory birds that are caught in thetrend of a cold wave in the spring has been noticed from timeto time and is now common knowledge. The destruction ofinsects that appear early in the spring, along with the injuryto flower buds by delayed frosts, are some pf the physical effectscommonly noticed during certain seasons. Finally, elevation of temperature so as to produce the otherextreme of drought is also productive in destruction of many South of Jackson Park, Chicago, August 21, 1903. 288 NATURE SKETCHES IN TEMPERATE AMERICA forms of animal life. From the foregoing remarks one may notethat the temperature, degree of humidity, and the wind aresome of the physical agencies at work exercising an influenceover the life of animals and jjlants, and in other chapters Ihave shown the reciprocal relation that some of the insectsbear to plants. In natures lalioratory will he found an endlesschain of circumstances that show the intricate adaptationswrought during the evolution of organic iFt IN Rviivi Weather HILE the pouimg ram is lc to the existenceof many other animals. For instance, it is thegala time for snails and slugs, as may he found byobservation in the woods. On humid days in the beechforest I have noticed that each one of the old stumps has itsslow moving inhabitants. In the holes made by the wood-boring insects, a good opportunity is presented of liecomingacquainted with the large grayish slug, Pln/lomyus my approach I found that some of these slugs had drawnthemselves up into robust oval bodies and were hiding justwithin the holes. Others were welcoming the rain and crawl- Diary Notes, Lakeside, Mieliigan, August. GENERAL OBSERVATIONS AND SKETCHES AFIELD 289 ing about on the old reddish wood. These slugs were verysensitive to the finger touch, and, when i
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