SUBJECTIVE LESSONS. <1) 



male (lilli'i-s fi-oiii tlic fcinalr. wliat st-asonal cliaii^'-o in 

 color may occur .' If llie sexes are alike, is there miicli 

 variation in color .' 



The Molt (Chai>iei- ill. pa<:^es 37, 38).— How are clianges 

 in a biril's plumai^c cliietly accomplished '. Ts tlio process 

 of moltinjj;- suhjeet to much variation .' What are lliese 

 variations appai-entl y dependent <jn :" At what time of tlie 

 year do all birds molt .' What usually occui's the folhjw- 

 in^- spring- .'' 1 >«• any birds have a complete sprin^f- molt ? 

 Are special i)Ium<'s evei- ac(piired at this season :* Describe 

 the manner in wliich the Siiowllake gains its breeding 

 di'ess. 



Color (UkI Food (C'iiapter III. page 3lh. — How is the 

 color of Canai-ies sometimes altered i "What is the eit'ect 

 of red pepper on fowls ? What is sometimes fed to Par- 

 rots to change their color ? How do Flamingoes and Scar- 

 let Ibises illustrate the relation between color and food ? 

 What color does the Puri)le Finch become in captivity ? 



Color and Cliinaie (Chapter IH, pages 30-41), — How 

 does climate affect the colors of birds i What does this 

 demonstrate ? How many races of Song Sparrows are 

 known ? What relation exists between their colors and 

 tlie climate of the regions in which they live ? Where are 

 the extremes in color found ? Ai-e these extremes con- 

 nected ? What is the j)revailing chai'acter of the colors 

 of Arizona bii-ds '. ( )f" northwest coast birds ? What ai-e 

 tiiese races of birds r I'nder what conditions might the}' 

 become specio r 



Color Olid lion III (I lid llohll (Chapter HI, ])ages 41-44).— 

 What is necesNary to an understanding of the value of 

 the colrn-s of birds '. What is theofliceof protective color- 

 ing .' What of dece|)tive coloi'ing t What are the i)revail- 

 ing colors of ground-inhabiting birds '. Give examples. 

 Are tree-inhabiting birds bi-iirhler than thos<» that live on 

 the ground :• What explanati«ui is advanced to account 

 for this :• I low do we receive an ei-roneons idea of the col- 

 ors of ti-opiea! birds ^ What has y\v. Thayer i)roved ? 

 What fact does he call attention to ? How does this tend 

 to conceal the animal i How does Mi\ Thayer demon- 



