Grundzüge der wissenschaftlichen Botanik : nebst einer methodologischen Einleitung als Anleitung zum Studium der Pflanze /

Carl Zeiss, Ernst Abbe, and Advances in the Light Microscope

“…In 1842, Schleiden had written that key scientific advancements were only possible with such compound microscopes [7], in which early attempts at corrected objective lenses were made by combining lenses of crown and flint glass possessing company, he wanted to acquaint himself with the day-to-day work of natural scientists. A report written by Schleiden about Carl Zeiss states that he "has familiarized himself, especially in recent times, with the needs of the nature researchers at the Physiological Institute and has thus put himself in a much better position to meet their needs than anyone else" [4].…”

“…"In terms of the greatest advancements in optical technology, one is able to procure very workable instruments at relatively low prices from any reasonably adroit lensmaker and no one, not even the youngest of our contemporaries, will live to see the day when one such instrument can no longer be used to do anything to further the cause of science" [3]. Here he is referring to Friedrich Körner, the erstwhile employer of Carl Zeiss.…”

“…… This instrument is perfectly sufficient for all entomological, pharmacognostic and botanical investigations, and even for wholly adequate anatomical observations ... At my instigation, Dr. Körner always keeps a number of these finished instruments in stock, and I believe I can recommend them, and certainly with a clean conscience, to all of those who are enamored by proper natural science studies, as I myself inspect each individual instrument before it leaves the workshop, and can say that it certainly deserves its excellent reputation" [3].…”

Charles Darwin and the Origins of Plant Evolutionary Developmental Biology

“…Guillard's work firmly established an ontogenetic and organogenetic perspective for the study of floral development. Jacob Mathias Schleiden, while perhaps better known for his widely used textbook (Grundzu¨ge der Wissenschaftlichen Botanik; Schleiden, 1842) and as one of the founders of the cell theory, also formulated important generalizations about the nature of floral development. In collaboration with T. Vogel, Schleiden examined legume species with papilionoid flowers and concluded that many of the distinctive features of these monosymmetric (zygomorphic) flowers arise gradually during development (Schleiden and Vogel, 1839).…”

The Microscope in Early Embryological Investigation

“…Measurements [13] reveal that the early achromatic microscopes had a resolving power of about 1 um and equalled or excelled simple microscopes in performance. Non-achromatic and simple microscopes continued in use, but by the 1840s the superiority of the achromatic compound microscope was recognized in S c h l e id e n 's [54] affirmation that 'the discoveries and observations [of the last twenty years] which have advanced science have been made by the compound microscope'.…”