370 - BOTANICAL GAZETTE [way 
but in view of the obscurity which surrounds the origin of the 
minute primordia from which the plastids first appearing in the 
embryonic cells arise, the question regarding the extent to which 
the plastids are to be considered permanent cell organs with an 
unbroken genetic continuity throughout the life cycle must remain 
an open one. 
5. In the case of those strains in which the inherited characters 
are transmitted according to Mendelian rules, it is inferred that 
the behavior of the proplastid is at least in part under the control of 
the nuclear mechanism. In those strains in which the inheritance 
of the unusual characters is non-Mendelian (maternal strains), 
it is very probable that an explanation of another kind will be 
found necessary. 
This investigation was carried on under the direction of Professor 
LESTER W. SHARP, to whom the writer wishes to express his sincere 
thanks and appreciation. 
CorNELL UNIVERSITY 
Irnaca, N.Y. 
LITERATURE CITED 
1, ALLARD, H. A., The Mendelian behavior of aurea character in a cross 
between two varieties of Nicotiana rustica. Amer. Nat. 53:234-238. 1919- 
2. Baur, E., Des Wesen und die Erblichkeitsverhdltnisse der ‘‘ Varietates 
Albomarginatae hort.” von Pelargonium zonale. Zeit. Ind. Abst. Vererb. 
13330-351. figs. 20. 1909. 
as , Untersuchungen iiber der Vererbung von Chromatophoren Merk- 
male bei Melandrium, Antirrhinum, und Aquilegia. Ibid. 4:81-102. 1910. 
4. , Mutationen von Antirrhinum majus. Ibid. 19:177-193. 1918. 
5. CavERs, F., Chondriosomes (mitochondria) and their significance. New 
Phytol. 13: eae 1914. 
6. Correns, C., Vererbungsversuche mit blass (gelb) griinen und bunt- 
blitterigen Sippen bei Mirabilis jalapa, Urtica iad und Lunaria 
annua. Zeit. Ind. Abst. Vererb. 1: 291-329. figs. 
, Zur Kenntniss einfacher Mendelnder heads II. Mirabilis 
jalapa sont und ihre Bastarde. III. Urtica urens peraurea. Sitzber. K. 
Preuss. Akad. Wiss. 221-268. 1918. 
, Vererbungsversuche mit buntblitterige Sippen. I. Capsella 
Bursa-pastoris. Sitzber. Akad. Wiss. Wien 34:585-610. 1919. 
7: 
8. 
