1. The karyotype of the mouse

   • W. Schnedl

   OriginalPaper Pages: 111 - 116

2. Cytological variations in the constitutive heterochromatin of Microtus agrestis

   • J. C. Lee
   • Jorge J. Yunis

   OriginalPaper Pages: 117 - 124

3. Isolation, fractionation and biochemical analysis of the metaphase chromosomes of Microtus agrestis

   • L. G. Skinner
   • C. H. Ockey

   OriginalPaper Pages: 125 - 142

4. The meiotic behaviour of autosomal heterochromatic segments in hedgehogs

   • A. T. Natarajan
   • A. Gropp

   OriginalPaper Pages: 143 - 152

5. The induction of orientational instability and bivalent interlocking at meiosis

   • Marian E. Buss
   • S. Alan Henderson

   OriginalPaper Pages: 153 - 183

6. Meiosis in translocation heterozygotes in the mosquito Culex pipiens

   • E. Jost
   • H. Laven

   OriginalPaper Pages: 184 - 205

7. Chromosome polymorphism in Avena ventricosa

   • Tibor Rajhathy

   OriginalPaper Pages: 206 - 216

8. The response of apical meristems of primary roots of Vicia faba L. to colchicine treatments

   • R. D. Macleod

   OriginalPaper Pages: 217 - 232