462 



THE MAINTENANCE OF SPECIES 



pared with one of Marco Polo's day, shows many new additions, 

 thanks to the patient and tireless labors of the small army of Droso- 

 philologists. 



I 



II 



III 



w 



83.5 — 



90.0 humpy 



-fringed 



. arc 

 /, plexus 



99.5 \ 

 100.5- 



los.on- 



105.: 



106. ± . — purploid 



107.0 J7 \Xspeck 

 107.5' \ balloon 



-'Atethal-Uo 

 6.01^- -^jbroum 

 S.±J\ /{blistered 



0.0 — -y — roughoid 



20.0 — — divergent 



X.0 



26.5^ 



35.0 



36.5 



40.1 \ 



40.2 -^: 

 40.4 



42!2- 



K- 



*^-°46:±^. 



46.5-" 



49.7 y 



50.±V 

 50.- 

 54.8' 



58.2 ~. 

 58.5 ^y. 

 58.7 </ 

 59.5 -V" 

 62.0 V' 

 63.1-^ . 

 66.2^ 

 69.5 v.^ 



70.7 -;: 



72.0 ■^' 



75.7--; 



76.2''^ 



91.1 



93.0 — 



1.8-7 



0.0 --^— bent 



y/i- 



^.< 



h.tn ^shaven 



9.0 ' \ eyeless 



;■— -sepia 

 ^ hairy 



— rose 



. — crcam-111 



^ minute-h 

 :^ tilt 

 ,^dicka€te 

 thread. 



scarlet 



deformed 



warped 



:^^^ki:in_ 

 .^ pink 

 ' Y^ maroon 



Xjduarf 



^curled 



hairy-wing sup, 

 : — stubble 

 ;^ sj)ineles3 



\ bitkorax 

 '\^bithorax-b 

 ' V> stripe 

 \ glass 



■^ delta 



^^ hairless 

 '■ — ebony 



\ band 

 :-— cardinal 

 \ white-ocelli 



• — rough 

 • — crumpled 



V^ beaded 

 \ pointed 



^ claret 



\ minute 



94. 

 100.7 v^ 



101.0 ^' 



106.2 — -*- — minute-g 



(After Morgan) 



" When it is remembered that Drosophila is a very tiny fly ; that paired 

 reproductive organs occupy only a small part within its abdomen ; that each 

 of these reproductive organs in the male is made up of several tubules ; that 

 within these tubules may eventually be found the sperm cells with plenty of 

 room in which to move about ; that within each sperm cell is a nucleus ; 



