MATERNAL INHERITANCE AND MENDELISM. 

 (FIRST CONTRIBUTION.) 



By K. TOYAMA 



{Zoological^ Institute^ College of Agriculture, 

 Tokyo Imperial University.) 



(With Plate XX.) 



CONTENTS. 



PAOB 



I. Certain egg-characteristics of the silk-worm 352 



n. The origin of those characteristics 353 



m. Besolts of line breeding of certain variants 353 



Series 1. The reddish-brown eggs fonnd in the normal divoltine 



" Shinkawachi " 353 



Series 2. The blae-egged variant found in the normal divoltine 



•• Kuni-nishiki " 357 



Series 3. The whitish-grey egged variant 360 



Series 4. The spindle-shaped eggs found in the normal univol- 



tine breed 364 



IV. Crossing of various breeds or variants possessing different egg- 

 characteristics 367 



Series 1. Crossing between Theophila mandarina and Bombyx 



mori 367 



Series 2. Crossing between normal egged breeds and the whitish- 

 grey egged variant 370 



(a) Crossing between tetravoltine normal egged breeds 



and the variant 370 



(6) ^^ossing between divoltine cross-bred normal egged 



w breeds and the variant 374 



(c) Crossing between divoltine normal egged breeds and 



the variant 374 



Series 3. Crossing between tetravoltine yellow and white. . 376 

 Series 4. Crossing between various breeds possessing special 



colour -characteristics of the ^^ 378 



Series 5. Inheritance of the crimson-egged breed . . 381 



v. General considerations 391 



VL Summary 401 



