Volume 22, Issue 1
July 1945, pages 1-29
pp 1-5 July 1945
pp 6-9 July 1945
pp 10-17 July 1945
In the study of the anatomy of the vegetative and flowering regions ofLeonurus, three important features have been observed:
The unbranched condition of the flowering axis with extreme reduction of leaf lamina;
The greater activity of cambium in vegetative than in the flowering region which appears to be due to the difference of photosynthetic activities in the two regions of the plant; and
The endodermis which is well developed in the flowering region is only a ‘starch sheath’ in the vegetative region. The change from starch sheath to endodermis appears to be concerned with the xeromorphy of the flowering region indicated by the extreme reduction of the leaf lamina in this region.
pp 18-29 July 1945
The detailed study of comparative morphology of mammary glands of four different strains C3H, A,dba and C57—from the ages of21/2 to 8 months shows that certain minor differences as regards the number of side branches, acinar clusters and dilatation of ducts are seen as early as21/2 to 3 months.
The significant developmental differences leading to abnormal growth at a later age are exhibited at the age of 51/2 to 6 months between the strains C3H, A and C57 whiledba forms a class by itself. The structural peculiarities of different strains are seen at definitely advanced stage at a later age of 6 to 8 months.
An attempt has been made to discuss the bearing of morphological differences on strain susceptibility to cancer.