It would be unsafe however to conclude that he had really arrived at what is known as the cell theory.
A theory of heredity must be reconciled with the cell theory.
In botany and zoology alike, the development of the cell theory is one of the most conspicuous advances of the century.
In the first twenty years (1839-59) of the cell theory it was a fixed principle that there were three essential parts of the cell.
The cell theory was for some time combated by the most eminent German men of science.
The cell theory was advanced, embryology was studied and science entered the secret house of life.
His earlier studies and discoveries contributed considerably to the systematic development of the cell theory.