The Karyology of Saprolegnia. 
BY 
A. H. TROW, B.Sc., (Lond.), 
Lecturer in Botany , University College of South Wales and Monmouthshire . 
With Plates XXIV and XXV. 
I N the summer of 1893 I proceeded to Freiburg with a view 
to acquiring, among other things, a knowledge of certain 
of the newest methods in botanical technique. Prof. Oltmanns, 
who very kindly allowed me to work in his laboratory, and 
gave me, especially at the outset, much invaluable assistance, 
suggested that I should apply these methods to the detailed 
study of the cytology of the sexual organs of the Sapro- 
legnieae. Humphrey’s (’ 92 ) monograph on the group had 
just appeared, and it was evident that there were still con- 
siderable gaps in our knowledge, more particularly with 
respect to the behaviour of the nuclei in the gametangia. 
The work was subsequently carried on partly in England, 
partly in Germany, until in the summer of 1894 I obtained 
results which suggested further study, which has been prose- 
cuted entirely in the Biological Laboratory of the University 
College, Cardiff. 
The long series of researches by De Bary (commenced in 
’52 and terminated only by his death) and Pringsheim (com- 
Annals of Botany, Vol. IX. No. XXXVI. December, 1895.] 
