132 



METABOLISM 



singault's experimental work, Saussure's results obtained general recog- 

 nition, and became what they are to this day, one of the foundation stones of 

 plant physiology. The older investigators, for the most part, expressed no definite 

 opinion as to the first product of carbon assimilation ; later on, carbohydrates, 

 amongst other things, were suggested, until Sachs announced that starch was 

 'the first visible product of assimilation'. We have already referred to the 

 more recent developments in this relation,, whereby it has been shown that the 

 chloroplasts can construct starch out of carbon-dioxide but also from soluble 

 carbohydrates as well ; on these, naturally, all the non-green parts of the 

 higher plants are dependent, as well as the great mass of Fungi, &c., which 

 are entirely unable, since they possess no chlorophyll, to carry out carbon 

 assimilation for themselves. Later on, we shall examine more closely the 

 mode of nutrition of these heterotrophic organs and organisms. 



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