Studies in Plant Breeding in the Tropics. 
BY 
R. H. LOCK. 
{Late Frank Smart Student of Gonville and Caius College, Cambridge.) 
I.—INTRODUCTORY: THE WORK OF MENDEL 
AND AN ACCOUNT OF RECENT PROGRESS 
ON THE SAME LINES; WITH SOME NEW 
ILLUSTRATIONS . 
CONTENTS. 
Introduction : Brief historical notes. 
I.—Mendel’s observations. 
(1) Monohybrids. 
(2) Dihybrids. 
(3) Tri-Polyhybrids. 
(4) The theory of purity of the gametes. 
(5) The paper on Hieracium. 
II.—Recent confirmation and criticisms. 
III.—The shape and colour of the seeds of peas. 
IY.—The views of de Yries. 
Y.—The observations of Correns on maize and other plants. 
YI.—Latency of characters. 
Y II.—Correlation. 
YIII.— De Yries’ analysis of floral colour. 
Conclusion. 
Summary. 
List of literature. 
rp^HE rediscovery in the year 1900 of Mendel’s Paper on 
plant hybrids (49*) instituted a new phase in the study 
of the problems regarding the nature of species, and the 
* Figures in brackets ( ) refer to the list of literature at the end of the 
paper. 
[Annals of the Royal Botanic Gardens, Peradeniya, Vol. II., Part II., August, 1904.] 
