MATERNAL INHERITANCE AND MENDELISM. 

 (FIRST CONTRIBUTION.) 



By K. TOYAMA. 



(Zoological Institute, College of Agriculture, 

 Tokyo Imperial University.) 



(With Plate XX.) 



CONTENTS. 



PAGE 



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



II. The origin of those characteristics 353 



III. Results of line breeding of certain variants 353 



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



" Shinkawachi " 353 



Series 2. The blue-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 Theopldla mandarina and Bombyx 



mori 367 



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

 grey egged variant 370 



(a) Crossing between tetravoltiue normal egged breeds 



and the variant 370 



(h) Crossing between divoltine cross-bred normal egged 



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 egg 378 



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



V. General considerations 391 



VI. Summary 401 



